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Found 609 results

  1. Okay so I’m engine swapping my 4.3 v6 2003 Silverado to a 5.3 V8. I have purchased the engine and transmission and I’ve been putting it together in my free time. Recently I purchased what I thought was a stock Ls engine harness. Turns out I drove 1 hour and something minutes to find out he was selling me a “Stand Alone Harness.” Since I was there already I decided to buy it. Don’t ask me why just know it came at a impressive cheap price and it included a complete intake, fuel rails, k&n intake, fuse box & all that good stuff. Now my question is, what would change if i was to use the stand alone harness on my swap ? Would it even work ? I don’t have much knowledge on stand alone harnesses just that they are used in hot rods, c10s, obs, ect... Any help would be great!
  2. It's never too early to start talking about the process of shopping around for a dealer, pricing, the ordering process, deposits, and production delivery times. Although we're still months away from orders being accepted, this thread is meant to be a place where everyone can check in and share their experiences as they go through the process. I'm also going to document as many important dates in this initial post as I can. I'll attempt to keep everyone up to date on start of production, any ordering limitations, and when the ordering system will go live. NEW UPDATES AS OF: April 25th, 2018 T1XX- 2019 Chevrolet Silverado and 2019 GMC Sierra - Important Ordering / Production Dates Pre-Production: NOW - Captured Test Fleet Production Confirmed as of March 31st. Fleet Order Entry Avaliable On Crew Cab: 4/26/18 Double Cab: 6/21/18 Regular Cab: TBD Retail Initial Consensus Month Crew Cab: May 1st Double Cab: August 1st Regular Cab: TBD Initial Dealer Order Submission Process (DOSP) Crew Cab: 5/17/18 Double Cab: 8/16/18 Regular Cab: TBD Production Start Up For Dealer Delivery Crew Cab: Quarter 3 - July/August/September Double Cab: Quarter 4 - October November December Regular Cab: TBD 2019 Chevrolet Silverado Start Up Schedule 2019 GMC Sierra Start Up Schedule This post will be updated whenever new information becomes available. Please contact me if you can help clarify any of these dates.
  3. So. I saw this on Instagram for anybody wanting to do something like this. They said they fabricated a thin piece of metal and painted it and then stuck it behind the grill center. Think it makes the truck look 10 times better. I’m gonna give it a shot and I’ll document the process for anybody interested. Believe I’m gonna go with red on mine
  4. John Goreham Contributing Writer, GM-Trucks.com 9-11-2019 General Motors has announced that NHTSA is mandating a safety recall for the following vehicles: 2014-2018 Chevrolet Silverado and GMC Sierra Pickups (1500 / 2500 / 3500) 2015-2018 Chevrolet Suburban, Tahoe, GMC Yukon vehicles 2015-2017 Cadillac Escalade NHTSA reports that the amount of vacuum created by the vacuum pump may decrease over time. The group says that as the vacuum level drops, the brake assist decreases, and that this increasing braking effort, extending the distance required to stop the vehicle, thereby increasing the risk of a crash. This new recall covers 3.4 million vehicles. The Problem: The brake pump uses engine oil to lubricate itself. If the pump becomes clogged with engine oil sludge the units ability to create vaccum is diminished over time. As a result, braking force and ability also drops. The issue is usually accompanied by a "Service Brake Assist" warning message in the dash. The Fix: GM will reprogram the computer that controls the secondary brake assist pump. The secondary pump will now activate at lower speeds and different situations quicker to compensate for any lost output from the main pump. Since the pumps are not failing, GM has decided not to replace them. GM's number for this recall is N192268490. In compliance with federal law, GM will notify owners, typically by snail mail. GM says that its dealers will reprogram the Electronic Brake Control Module. However, GM has not yet provided a notification schedule. Owners may contact Chevrolet customer service at 1-800-630-2438, Cadillac customer service at 1-800-458-8006 or GMC customer service at 1-800-462-8782. If you own one of these vehicles and wish to check to see if your vehicle is included (or not) you can do so at this link immediately. As with every safety recall, customers will not be charged by GM for the needed repairs or modifications. NHTSA's public information on this issue indicates that many accidents have been reported to NHTSA including some with injuries. This recall is the result of a NHTSA investigation that lasted nearly a year. In its investigation report, NHTSA noted the following details about the problem:
  5. Hi everyone, I have been working on a 1997 Chevy 1500 WT. I just happened to be working under the dash and noticed that the green wire that goes into the firewall harness connection was disconnected. Does anyone know what this green wire is for? (please refer to photo below) I looked at the wiring diagram and it looks like it goes to the MAF which I think is for the speedometer operations. Now my second question is, if it is for the MAF where should I try to reconnect. I obviously can't get it back into the bulkhead. Can I bypass the bulkhead and run a jumper wire? I would be appreciative for any help. Thank Jaylin
  6. Need some opinions on what the heck is going on with my 2007 silverado classic. It has a 4.8 litre vortec with an afe cold air intake, edge cts2 programmer, gibson shorty headers, and a 3 inch catback exhuast. I have the code p0430 coming up but cant figure out what it is. Ive done a back pressure test on the cats, and did knock sensors and all O2 sensors a year ago. It doesnt feel like it has a misfire and im very mechanically inclined and everything in this truck is looked after. When i bought it there was a 4wd code and it wouldnt engage so i swapped out the button cluster in the cab and now it works fine. Other than that the truck has been perfect but id like to figure out what the heck is setting off the code. I have no exhuast leaks and the cats checked out perfect, anyone know what else it could be? Im looking for anything at this point, i hate check engine lights and have cleared it with the programmer but it comes back very shortly after being cleared. Thanks
  7. What’s the cheapest most efficient 3/5, 4/6 lowering kit or drop for a 2014 Silverado crew cab standard bed 2wd 5.3???
  8. Zane & Josh Merva The Merva Brothers - Co/Founders, GM-Trucks.com GM-Trucks.com is always trying to stay on the bleeding edge of General Motors vehicles and the aftermarket accessories that owners install on them. That’s why we occasionally purchase long term pickups to better understand the ownership experience of these extremely popular vehicles. Our last truck, a 2011 GMC Sierra All Terrain, continues to serve us well all these years later, but became outdated in 2014 when the K2 generation of trucks was produced. We never had a chance to purchase a 2014-2018 Silverado but had a half dozen close friends who let us work on theirs. So when GM announced that the 2019 model year Silverado and Sierra would be brand spankin' new, we knew we had to have one. Thus, a year long effort was set into motion during the Winter of 2017-2018. Internally, GM-Trucks.com declared war on the 2019 Silverado. We could cover it, we would own it, we would be THE place for owners of the T1XX generation to call home. To do that, we had to have one ourselves. We saw the surprise unveiling, followed trim level news, ordering information, factory startup, placed an order the first day we could, then waited (not so) patiently for it to arrive. In September 2018 we took delivery of our new 2019 Chevrolet Silverado LTZ. Here it is a few seconds after the first time we saw it. What’s the plan? We’re going to make our new Silverado work for us and you. Over the next few years we plan on transforming our truck, installing loads of aftermarket parts, and reviewing everything in the process. Our thought process behind this Project Truck is simple. We originally wanted to buy a Silverado Trail Boss but found that Chevy wouldn’t let us get it with the all new 6.2L V8. That engine and the brand new 10-speed transmission was reserved for those who purchased an LTZ or High Country. With the 6.2L being more important, we acquiesced and ordered a more expensive LTZ instead. Thus, our mission to replicate the Trail Boss’s off-road stance and beefed up attitude but with a legendary 6.2L engine and a more luxurious take on things was born. We've decided to call it…. Project Trail Beast More than just a name, Project Trail Beast is a set of core vehicle modification goals that we’d like to accomplish with our 2019 Silverado LTZ. The ultimate goal is to create the truck that Chevy should have made… a Trail Boss with a 6.2L engine. Thankfully, we’re not bound by factory parts anymore, so we can go a little more hardcore than Chevy would have. Our goals include: Suspension Lift: We’ll take our Silverado and raise it a modest 2-4 inches. More aggressive tires are a requirement and aftermarket rims are being considered to complement the higher stance without sacrificing driveability. Beefed Up Performance: 420-horsepower stock isn’t bad…. but isn’t nearly enough. We’ll explore adding a supercharger to our 6.2L and work with leading brands to install performance intake and exhaust systems. We’ll also check in on the custom tuning scene and how the 2019 models can be modified on the inside. Updated Lighting: Even though most of our Silverado has high tech LED lighting, there are still some conventional bulbs. We’ll replacement all with the latest LED tech and add additional illumination around our truck. Expect us to talk about and review industry players such as Sylvania and Baja Lights soon. Utility Accessories: We'll explore bed covers, floor mats, security products, custom keyed locks, ceramic coatings, and a wide range of other accessories that any truck owner may use or need on their vehicle. From Adams Polishes to Husky Liners, we’ll look at what works and what does not. GM Official Accessories: GM is upping their game and offering lots of performance and visual accessories right from the dealership. We opened up a parts account and immediately started buying. How do these products perform? Are they worth the price? We'll let you know Help Us Out! What Do You Want? Do you want a particular product reviewed? Can't decide on a truck safe? Or confused about Ceramic Coatings? Let us know! We’ll do our best to review anything we can on Project Trail Beast. Do you work for a company who has a product you’d like us to look at? We can do that too. What’s next? It's time to get installing. We have a fat pile of accessories we've already started to work on. Each product, each experience, we'll share with you. Stay tuned for more updates on Project Trail Beast.
  9. Theft deterrant light comes on, airbag light comes on, and speed odometer going crazy. All of my gauges basically go crazy on my cluster after 2 minutes of driving. I want to say its the body control module but I also think its the HMI. I need help with this issue. Do i order a new BCM and have it snet in to get programmed to my VIN or take it to the dealer and
  10. I was wondering what a good swap would be. I have the stock 5.3 but I want some umph. I travel for work and still need gas mileage but I have hit a dead end in research. Can anyone help me?
  11. Hey everyone, I just wanted to make sure any of you 2020 guys saw two videos we recently put together on the 2020 Silverado HD. More to come as the embargo breaks on what we can say next week. Enjoy and make sure to like and subscribe to our channel, PLEASE.
  12. Hi guys, I am new here and I have been enjoying my truck for about 7 months now. Just figured to take some photos of the truck since the first round of my mods is done. Mod list - 18 inch Volk Racing TE37 Large PCD Wheels - Retrax Tonneau Cover - AMP Research Powerstep I hope you guys enjoy the photos
  13. The Merva Brothers Founders, GM-Trucks.com February 27th, 2019 When you take delivery of a brand new 2019 Silverado, you'll be faced with a few choices beyond which trim level or options you want. You'll also be asked which accessories you want to be installed on your truck before it rolls off the sales floor. Most GM accessories can even be factored into the sale price and financed. So, we're setting off to try out some of these certified accessories that are available for the 2019 Chevrolet Silverado. Our goal is to let you know if they are worth the cash or if you should take a pass. We've always loved the look of a blacked out bowtie and the idea of one that lights up seemed too cool to pass up. So we headed to our local dealership and ordered the 2019+ Illuminated & Blacked out front bowtie. Here's how it went and what we think. What is it? Chevrolet Illuminated Grille Bowtie Emblem in Black Part Number: 84069488 MSRP: $275.00 Manufacturer Website: https://accessories.chevrolet.com/ Main Features Doesn't effect your factory warranty Direct replacement for the standard gold bowtie Same quality as original parts Wiring harness is plug & play and matches factory wiring Here's the bowtie and grille as it came from the factory. Installation The first step to install the illuminated bowtie (or the non-illuminated black bowtie) is to remove the front grille. The grille on our LTZ was easy to take once we understood how it was fastened to the body. The entire process runs around 30 mintues We'll be covering how to remove the grille on the 2019 Silverado in detail soon. A plastic trim removal set makes this process much easier. After a little bit of pulling and careful prying, the entire front grille section comes off. Note the grille can be removed without having to take off any body panels or reach under the vehicle. This is a huge improvement over past Silverado generations, which required more disassembly to access the grille mounting hardware. The grille is a solid unit. Switching it out with another trim level's grille would be easy at this stage. This is also a good time to clean up the grille. To remove the factory bowtie, release four tab clips on the backside of the grille. One is inside of the support post where you will also run the bowtie's wiring harness. We popped out the bowtie and cleaned behind it before installing the new one. It was filthy underneath! The included wiring harness plugs into the driver's side headlight harness. It then snakes through the radiator opening and clips to the bumper. We found it easier to run the wire through the grille and connect it to bowtie, THEN snap the bowtie to the grille afterwards. Attempting to plug the harness into the bowtie after it is mounted on the grille turns out to be extremely difficult. We tested the bowtie to make sure it lit up properly before we attached the grille back onto the truck. Our Impressions Installation of the illuminated bowtie turned out to be pretty easy provided we used the right tools. Our plastic trim kit was invaluable during the process, allowing us to pry and remove pieces without scratching them. The kit also didn't come with instructions, so make sure to ask your dealer for a set of them when you buy it. They can print it out for you. The quality of the bowtie is on par with other factory parts and matches accordingly. The wiring harness looks similar to those already running under the hood giving the final fit a factory feel. So while the look and feel of the product is excellent the actual performance of the illuminated bowtie left us wanting more. We expected an illumination effect with a similar brightness to our DRL lighting. Instead, the bowtie glows a dull white at light. During the day or bright sunlight the illumination effect disappears completely. We do appreciate that the color temperature of the bowtie matches the headlights and DRLs. The MSRP of $275 is steep for the eventual lackluster performance. Excellent build quality, plug and play performance, a factory look, and no warranty interference offset the price to an extent. If you want a quality replacement for your gold bowtie that adds a little more flare to your 2019 Silverado, the Illuminated Black Bowtie could be right for you. If you're looking for a bright centerpiece that stands out with the same intensity as your other lighting, this may not fit your bill.
  14. Looking to put proformance muffler on my 2019 trail boss, it comes with the “dule” exhaust, any suggestions which one to go with to give it a little something that I feel like it’s lacking. Had dule magnaflow on 2008 gmc slt, that was great. Any thoughts would help
  15. I purchased a brand new 2019 2500HD LTZ Iridescent Pearl, 2 weeks ago here in Oklahoma. The truck had 26 miles on the odometer. 3 days after I brought it home, I gave it its first washing. I was so proud of this brand new truck until I ran into rust, on the lower part of the doors. I thought to myself I just purchased a brand new truck for $60,000, why in the world am I seeing rust. I immediately crawled under the truck to find multiple components that have significant/moderate red rust showing. The trans pan and rear disc brake covers are losing their plating with rust coming through. I immediately contacted the salesman asking to bring the truck back and trade for a different one, but......I was told financing already went through and they could not take it back. That was 3 days of ownership. It's been very painful and disappointing to this point, but I did get the truck into the Service Manager and he took pics and trying to see what GM is willing to do. I just came back to Chevrolet after years of Purchasing Ford products. I even have my 1949 5 Window that I drove in college. Has anybody seen this before on brand new GM trucks? See Pics
  16. Hey guys I’m new to the forum as well the brand. I recently just bought a 2019 custom trail boss which only offers the 5.3. I wanted the 6.2 but that came with only the higher trims. I’m familiar with the 5.7 hemi and I’m kinda down about the 355 horsepower/ 383 torque compared to my hemi that I traded. What can I do exactly to get more power to the engine?
  17. new here. just throwing this out there to see if anyone has info on how hard it is to convert the front bumper on a 2006 Silverado 2500HD to a 2018 Silverado 2500HD or what needs to be done to get it done. heres a picture i found on Facebook of it done. just need more info.
  18. Looking to purchase a center console. Needs to fit 2014 Silverado. It Doesn’t have to be in perfect condition. But not in pieces either. Shoot me a PM or email if you need to contact. Email: [email protected] Thanks
  19. Wanted to reach out to the forum and see if anyone has ran into these issues with their radios. I have a Tuscany build 2015 Chevrolet Silverado 2500 6.6L, LTZ, Z71 build and I have a stock radio head unit that seems to have problems when connecting any phone to it. I use one device (iPhone XS Max) and it works via Bluetooth, however, there are times when the Bluetooth doesn't drop off but I get no sound from the speakers but still shows the song playing. The workaround I have discovered is to cutoff the ignition and turn it back on and the song plays over the speakers. Is this a known issue or is this something I need to get my dealer to look at? TIA.
  20. Bought a brand new 52K Chevy Tahoe December 2017. At first I was extremely satisfied with the vehicle but one day (approx 16 months after purchase) I decided to park on a hill on a rainy day and to my surprise water began dripping from the headliner. I then googled the issue and sure enough the XM antenna leaks!! GM has apparently been aware of the issue since 2015 but failed to correct it. Now I deal with possible electrical issues and molding in my future and feel completely helpless. Sure wish someone would have told me before I bought it! 104A7881-C2E6-49DB-A97E-B69CEA16EFAF.MOV
  21. Zane Merva Executive Editor / Publisher - GM-Trucks.com June 21st, 2019 The 2020 Chevrolet #SilveradoHD is draped with an all new design that is totally unique from its light-duty 1500 sibling. Take a walk through with us and 2020 Silverado Lead Exterior Designer Brian Izard to learn more about the 2020 Silverado HD's design and features.
  22. I am currently looking for a mechanic/shop that will fully delete a 2017 Chevrolet 2500HD (L5P), hopefully around the Mississippi/ Louisiana area. Any help will be greatly appreciated.
  23. Zane Merva Executive Editor / Publisher - GM-Trucks.com June 21st, 2019 We recently had a chance to check out the all new Silverado HD. The 2020 Silverado HD has an optional 8 camera system to help aid in towing your trailer. We get a full walk through of the various views and camera angles.
  24. Thom Cannell Contributor, GM-Trucks.com March 7th, 2019 Heavy Duty trucks mirror the contest for market domination in light duty trucks. This year both GM and Ford announced significant upgrades to the engines powering their all new 2500 and 3500 HD trucks as each company upgraded their diesel engine, and delivered new gas engines. At GM, the launch event centered on Chevrolet, who brought in truck writers from every segment—popular to fleet management—to Flint, Michigan’s Flint Truck Plant. Flint is the original home of General Motors trucks and the spiritual and historical home of the UAW. So, Flint Truck Plant is receiving an all-new facility constructed and designed for just HD trucks, with the former truck assembly areas destined for warehousing and future projects. New L8T 6.6-Liter Gas Engine We first spoke to Mike Kociba, a GM engineer and part of the Small Block team to learn about the new 6.6-liter V-8 engine we'd been anticipating. Mike told us the new motor “is a marriage of the six-liter it replaces and an upgrade in technology levels to Gen 5 architecture.” A careful look will disclose similarities in key areas where GM has maximized their experience with the six-liter’s durability and improvements in performance levels derived from Gen 5 architecture. “Specifically, new here is the gray cast-iron block which is unique for this application, hyper-eutectic purpose-built pistons for this application and heavy-duty requirements, forged powdered-metal connecting rods, and a forged steel crankshaft,” Mike continued. The most significant change is the addition of Direct Injection. It’s all new, an industry first for the heavy-duty market and new to GM trucks. “When we added DI, we took the roughly 400 KPa fuel pressure from the low-pressure pump and dialed it up to roughly about 15 mPa for engine operation under key conditions,” Mike continued. “That allows us to increase compression ratio, now 10.8:1 using regular fuel. Without DI you're not going to hit those numbers without losing a lot of spark efficiency. With those additions, and the six millimeter longer stroke, that gets us up to 6.6-liters.” “That suite of changes allows us to hit class-leading gasoline engine torque, at 464 foot-pounds at a lower engine speed than the outgoing six-liter was optimized for. I'm proud of its 401 horsepower, which is SAE Certified, no games, legitimate. This (engine) is purpose-built to crank out those numbers day, after day, after day with no compromise in durability. Customers can have confidence they're going to pull, tow whatever trailer you need.” There are other new features like an all-new water pump and a massive cooling fan to meet the demands of the HD customer base. New is how the water pump drives the fan through a one-inch shaft using purpose-built bearings to handle loads. Another first for HD is a variable-output oil pump. “No mater what the severe operating condition is for the customer, the pump is capable of dialing in more, or less oil pressure regardless the requirement. The engine features an aluminum oil pan, nylon 6-6 air intake, and stainless steel exhaust manifolds unique for the Heavy Duty market. That’s because HD market has specific requirements for (fuel) enrichment and these stainless manifolds will meet those requirements. “We have variable dual-equal valve actuation, like on light duty, where intake and exhaust are phased together and controlled through the actuator on the front cover. It's chain driven for accessories.” GM designed this engine specifically for upcoming standards for particulates and NOx emissions standards. “With this architecture we're not just making power and torque, but improved emissions and improved efficiency.” Mike continued. We noted the massive valves, which Mike said are common with Gen 5 architecture for valve layout and their pushrod technology. “That's how we get this compact shape. When you compare the size of the two engines, they're similar, which is due to the common 4.4-inch bore spacing.” A unique feature of the new engine is inter-bore cooling. Coolant flows between the Siamesed bores, notably in the upper bores where there’s a tendency to generate higher temperatures. “For two-valve technology of course you've got the spark plug, and the fuel injector, splayed outside. To avoid heat, we have the coil mounted directly on the rocker cover and the boot mounted next to the manifold with industry-standard individual coils for each cylinder.” This is great stuff, we though, but engine development isn’t cheap. So, why a new 6.6-liter when the 6-liter was doing well? “We needed to improve to Gen 5 level of technology to be sure (the engine) is capable of delivering on durability requirements. Customers love the convenience of gas, but if you look at the market—for instance trailers with more gadgets and slide-outs—everything is getting heavier. Customers want to be sure they can tow with confidence, no compromises, whether it's fuel economy, power, torque, emissions, efficiency, they don't want to pull up to their neighbor and have to make excuses. That's what we targeted. No compromises. With the significant technology we put into this engine, it makes segment-leading torque without compromising efficiency or emissions. Peak torque is at 4,000 rpm, 400 rpm lower than the 6.0-liter. Three things enable the new 6.6-liter's better power output. Direct injection (DI) allows us a higher compression ratio; longer stroke is good for increased torque (but not as good for horsepower as piston speeds are high) and for heavy-duty application where you need torque everywhere it’s why we focused on a longer stroke to get to 6.6-liter displacement. Those changes enabled us to broaden the torque curve, which is up 20% everywhere, for greater work potential.” We thanked Mike and asked if we’d missed anything. “Small engines with turbochargers allow them peak torque off idle, but for heavy duty we don't want that complexity. For the Heavy Duty segment we (General Motors) have durability requirements—Global Engine Durability—that are unique and very long and stringent requirements. We know customers need 401 horsepower and 464 lb.-ft. of torque today, tomorrow, and every day for years to come with no compromise in durability. We know our customers and, if they can't use their truck today, they might not get paid. That's why we focus on durability.” Brand New HD 6-Speed Transmission With that in mind, we next spoke to the systems chief engineer for six-speed FWD and RWD transmissions Rich Mardeusz. More power and more torque tend to break an older transmission. So, we wanted to know what changes had been made to the new transmission to carry the additional torque. “We started with the 6L90 that's in the current HD vehicles and full-sized vans (and ZL-1 Camaro and CTS-V), received the horsepower and torque curves from the engine engineering teams and then performed an analysis of all mechanical components from front to back,” Rich said. General Motors uses specific simulation tools for different parts. “For instance, we have a "gear damage analysis tool" for analyzing the gear set and how much damage it may receive over the life of the vehicle,” Rich told us. The result was a need to improve the torque converter and the clutch pack, which needed to be more robust to accommodate the greater power output of the upgraded 6.6-liter V-8 engine. From a clutch pack standpoint, changes were simple, according to the engineer, as there was enough room in the case to add a clutch and one backing plate to each of the clutch packs to handle additional power. When it came to the torque converter, things changed. “We looked at the components from a heavy-duty diesel torque converter and a high-output gas torque converter and then took the torque-carrying components from the diesel and married them to the spring and damping components from the gasoline torque converter. That’s what was needed to accommodate the approximate 22 percent across-the-board torque increase.” So, the new torque converter can A) handle the added torque of the new engine and B) damp out the firing frequencies from the gasoline engine, which are significantly different from a diesel engine. All of the shafting and gears were able to handle the torque. Interestingly, there is no dipstick. GM has the confidence to eliminate it, and only change fluid at suggest intervals of approximately 100,000 miles, more often for those who mostly tow, or drive over mountains with full loads. Another surprise, the transmission uses GM-spec Dexron VI fluid, GMs standard since 2005, as they found no reason to change. 2019 L5P Duramax 6.6-Liter Once we’d completed our gas powertrain interviews, we turned to the diesel side of Heavy Duty. We spoke to Max Sala, whose Italian accent tipped us to an affiliation with GM’s diesel engine center of excellence in Turin, Italy. Max said that their objective for the new Silverado HD was to increase towing capacity and ensure functionality with the new Allison/GM transmission. Remember, the Duramax 6.6L Turbo-Diesel V-8 engine makes 445 hp. and 910 lb-ft of torque. “We added a bigger fan now 28-inches, a bigger oil cooler that is upgraded from 14 plates to 19 plates, and we fine-tuned the cylinder head gasket” Next up were improvements to the engine-brake capacity, taking into consideration towing capacity. “It’s better by 14-percent and we introduced smart activation of the engine brake,” Max continued, “There's still a button for manual activation, but for safety there's automatic activation at certain RPMs.” Under the new control system, the powertrain will recognize any need for the engine brake and activate automatically. For instance in driving down hill and forgetting to shift, the higher RPM means automatic activation. “With that, we have better after-run strategy. Every time you tow uphill, temps rise and you have a message to cool the engine when stopping. If, by chance you forget and close the door, the system cooling system activates automatically for up to 15 minutes to cool the engine for reliability.” That isn’t the end of changes, as the engine has been completely recalibrated to match the new 10-speed Allison transmission. “Emissions have been improved and fine-tuned to maintain the best efficiency the transmission can offer to our customers.” With these changes, most importantly, Chevrolet says they are now capable of delivering full torque at any time, in any gear, and that they have done everything to the engine, transmission, driveline, drive shaft and frame to improve strength and durability. “What's important is how safe (the new HD trucks) will be and how comfortable it will be for our customers to drive these huge trailers up, and down hills.” Max concluded. Allison transmissions have gained a peerless reputation for strength and durability. Adding a 10-speed transmission branded with the Allison name is a great choice. David Ames, now GM assistant chief engineer on the Allison transmission and liaison with Allison, is a former Allison engineer. A natural fit. The 10-speed is a collaborative effort with joint development of the analysis, engineering, as well as testing. So, testing was performed at Allison and at GM, each with their own set of rules and test regimes. “We go back and forth”, David told us. “Today we have a ratio-span of five and this transmission has a span of 7.2, so the new 10-speed provides both more overdrive and a lower first gear.” We asked about the projects’ starting point. “We (at GM) come out with a "here's what we're looking for" and we begin an internal development contract. It was a pretty clean sheet of paper. So, the controls on the bottom are from a smaller 10-speed, some pieces and parts, but not the entire controls package. For the most part, it's all new to handle the increased power and much larger torque. We collaborated with Allison on this transmission (GM does have a 10-speed transmission of its own) which made it necessary to meet their (Allison) design requirements, their analysis requirements, their engineering requirements, as well as our own. It's a very compact transmission. If you had a 6-speed for comparison, this more dense, more compact and solid to get ten speeds into a package that would still fit nicely into the vehicle and not take up too much space,” David continued. This transmission’s torque converter has a lock-up clutch and is unique in that it will lock up in first gear, even under max loads. So, if you're pulling 33,500 pounds, you can do a first gear launch and lock up right away, which helps get rid of heat. We asked David why this is important. “Normally in first gear you're under high torque and generating a lot of heat, which puts a lot of demand on the cooling system. Locking up gets rid of that heat and the 7.2 ratio gives you a lower first gear. For instance, the six-speed uses a 3.1 first gear and the new transmission has a much lower 4.5 first gear. It's got four planetary gear sets, six clutches and the main place you'll notice the ten speeds, not only in launches and driving with heavier loads—it's very smooth—is going down a grade. Often you're trying to downshift to save brakes and having ten gears you can usually hold the right speed and not feel like you're running over the car in front of you, tapping the brakes or going too slow.” “Also, we built in the first OEM PTO option. Note that the chain drive to the PTO is engine-speed driven rather than turbine-speed driven, which is important to many commercial customers, and it’s quieter drive than gear driven systems.” We asked David for an overview of the combined Duramax-Allison package. “For those who need it, it’s a nice package, one we're very proud of because of the outstanding durability. I think we're going to do a better job of putting power to the road than anybody out there. Whatever torque the engine is putting out, it's getting to the road in an accurate way. I think this transmission will be far more durable than people need it to be. Four-five years from now people will understand how durable it is.”
  25. Thom Cannel: Article & Photos Zane Merva: Photos & Video GM-Trucks.com June 25th, 2019 By now you prospective 2020 Chevrolet Heavy Duty owners are over the Ho-Hum of our 2020 Silverado 3.0-liter story (we are totally Ho-Ho-Ho and Hmmm, can’t wait for a longer test!) and looking at the Alpha Dog, the 35,500-pound tow-rated Silverado Heavy Duty and its over 50 industry firsts including an updated diesel engine and all-new 6.6-liter gas engine. Let’s get to it. Where to start? With its amazing trailer towing features that include 15-view camera and ability to memorize the features of five different trailers? How about the Durabed with its class-leading cargo volume and all-steel construction with a plethora of cargo tie-downs? Maybe you’re gobsmacked by the corner and bed steps with, now, plenty of toe room and 500-pound weigh-holding capacity? Is it the power tailgate that remotely lifts or lowers? An ability to hold first gear while towing maximum weight? Or, is it all of these? Chevrolet states that Heavy Duty trucks are working vehicles, whether towing a gooseneck horse trailer or flatbed and whether gas or diesel-powered. They further tell us that, compared to light duty trucks where 84-percent are retail and 12-percent go to fleets, Heavy Duty buyers are 70-percent retail and 30-percent fleet. Further, Work Truck and Custom trucks make up the volume; LTZ and High Country capture an even larger share of the market for personal and dual use buyers, with mid-trim LT trucks straddling fleet and personal use. Hence the five available trim levels to suit the needs of every buyer. There is no mistaking that the 2500HD and 3500HD is kin to the 1500, yet only roof sheet metal is common. Everything about the new HD trucks was designed to be functional from larger grille to lower side-height bed, to improved box and bed steps. It’s massively bold with strong character lines, huge fender wells and functional hood scoop. Both the 2500HD and 3500HD are distinctive and clearly Chevrolet. For 2020, every frame is boxed and steel, there’s a model with built-in gooseneck cross-body reinforcements and bed holes, 4X4 models can option Autotrac two-speed electronic transfer case, the DEF tank is relocated inside the frame rails with the filler under the fuel door, plus a 10-segment DEF gauge measures content. A statistic to toss off at your microbrewery; within the total HD segment, 54-percent are Crew Cab diesels while within fleets, 62-percent are gas-powered, with 34-percent of fleets buying Crew Cabs and diesel power. And if you’re wondering where the 2020 Silverado HD you’d like to scope out on your dealer’s lot is hiding, Crew Cabs began delivery last week with Regular Cab, Double Cab and Duallies hitting the streets this fall. Restrain yourselves. Let’s now talk about the biggest reasons for owning a Heavy Duty Chevrolet (or GMC). It’s towing. And if you’ve noticed comments to our 15-camera article, there’s some passion about technology. Realistically, as many HD trucks are sold to new truck owners towing large RVs, anything that improves road safety is flat wonderful. If you further read Chevy’s research that says 12-percent of pickup drivers have gotten into a fight with their significant other over trailer hookup, you’ll understand executive chief engineer Tim Herrick’s comment that “We save marriages.” Having driven every truck segment from light duty to tractor-trailers we feel you. So, when research says a majority of drivers are stressed by towing, please offer them a 2020 Silverado sales brochure and a tissue (and save a tissue for yourselves ‘cause you might be exaggerating your tow-cool). So let’s dive deeper into the subject. Everyone has a hitch camera these days, with overlaid guidelines to put you within a few inches, front-to-back, of the ball. Chevy goes further with a selectable view that looks own over the ball. Even those who haven’t set a hitch in years—or never—can get within a quarter-inch of perfect. And an APB or automatic parking brake engages automatically so that when you lift off the brake pedal you don’t roll off the ball. Sticking with the non-pros and semi-pro haulers, there’s a checklist for your trailer, the ability to check the lights after connecting the trailer’s electrical system, a tow-haul reminder and VIN-specific labels for the trailer itself. If you option the smart trailer integration, which is designed to work with ASA Electronics iN∙Command® control system, you have control over trailer features like heat and air conditioning through the infotainment system or the myChevrolet mobile app. And nobody should turn down the ability to monitor trailer tire pressure and temperature. Blowouts are never convenient and most often low-pressure and highly temperature related, according to Michelin Tire Company. We found the 15-view system difficult to get used to during the first five minutes, particularly when backing; our mirror habits are embedded. Yet, simulating tight turns where we could see along both the tight and far side, pulling forward into a tight box, or backing (after a few tries), we really came to appreciate what the system could do. Then, on the highway with an 18,000-pound box trailer behind us, mirrors just didn’t cut it compared to the high-tech camera system. We were driving on twisting two-lane blacktop in mountain foothills. Using the entire camera tech set, particularly the ability to look out the back of the trailer, we could easily pick places to pull aside to let faster cars pass us. It took less than an hour to become a must-have feature. Later we towed a smaller skid-steer on a flatbed without the system and truly missed it despite using our slide-out mirrors fully extended. This naturally leads to the two engines offered in the 2020 Heavy Duty, first the 6.6-liter V-8 purpose-built gas engine that delivers 22-percent more torque than its predecessor. Now it delivers 401 horsepower and 464 lb-ft of torque. It’s mated to a six-speed automatic transmission. The 6.6L isn’t a just a 6-mm stroked 6.0L, rather it takes advantage of the Gen5 small block architecture and has a unique cast iron block with forged powdered-metal connecting rods and forged crankshaft. The most significant change is the addition of Direct Injection. It’s all new, an industry first for the heavy-duty market and new to GM trucks. Direct Injection allows a compression ratio of 10.8:1 Quoting Mike Kociba, a GM engineer and part of the Small Block team, “Our suite of changes allows us to hit class-leading gasoline engine torque, at 464 foot-pounds at a lower engine speed than the outgoing six-liter was optimized for. I'm proud of its 401 horsepower, which is SAE Certified; no games, it’s legitimate. Customers can have confidence they're going to tow whatever trailer they need.” Don’t forget the larger cooling fan and newly designed water pump. The pump drives the fan through a one-inch shaft with unique bearing design to handle greatly increased thrust loads. Plus, the oil pump is now has variable output, so there’s less parasitic losses. The 6.6L engine features an aluminum oil pan, nylon 6-6 air intake, and stainless steel exhaust manifolds unique for the Heavy Duty market. Like related light duty Gen 5 motors, this motor has variable dual-equal valve actuation, massive Gen5 valves and uses an actuator that’s mounted to the front cover to control intake and exhaust valves. The new block features inter-bore cooling, that is, coolant flows through Siamesed bores, notably in the upper bores where there’s a tendency to generate higher temperatures. “Small engines with turbochargers allow them peak torque off idle,” Mike told us, “but for heavy duty we don't want that complexity. For the Heavy Duty segment we (General Motors) have durability requirements—Global Engine Durability—that are unique stringent. We know our customers and why we focus on durability. If they can't use their truck today, they might not get paid.” When towing a heavy load, we loved the diesel’s engine braking capability. What about the gas engine? In Tow-Haul, up-speeds caused by downhill driving—together with intelligence based on throttle position—the powertrain produced seamless downshifts. It’s not quite the same as engine braking, but the trailer was “only” 12,000 pounds. Regardless, it was a comforting addition to stress-free towing. The six-speed transmission used for 2020 Heavy Duty GM trucks is an updated 6L90 with an uprated torque converter and clutch pack. According to GM engineer Rich Mardeusz those changes were simple. When it came to the torque converter, things changed. “We looked at the components from a heavy-duty diesel torque converter and a high-output gas torque converter and then took the torque-carrying components from the diesel and married them to the spring and damping components from the gasoline torque converter. That’s what was needed to accommodate the approximate 22 percent across-the-board torque increase.” Those changes also damp out firing frequencies from the gasoline V-8 engine, making the powertrain smoother. Since a majority of buyers opt for the diesel engine, let’s look at that. Also displacing 6.6-liters, the Duramax turbo-diesel makes 445 horsepower and 910 lb-ft of torque. It’s coupled to a 10-speed Allison transmission. There were minimal changes to the engine for 2020. They include a 28-inch fan for cooling; upgraded oil cooler—now 19 plates instead of 14 and the cylinder head gasket was improved. Engine brake capacity is greater by 14-percent and while there’s a button for manual activation, while in Tow-Haul mode engine braking is automatically activated at certain RPMs. It’s Chevrolet keeping you safe. Thus, under the new control system the powertrain will recognize any need for the engine brake and activate automatically. For instance in driving down hill and forgetting to shift, the higher RPM means automatic activation. We did experience this with the18,000 pound box trailer and it is amazingly transparent and surprisingly quiet. You don’t have to downshift on modest hills, as the system will totally keep you at, or near your desired speed. Of course you may have to use a bit of smooth brake application if the grade is longer, or steeper. For really steep downhilling Plus-Minus buttons on the column-mounted shifter initiate gear changes. We’re not huge fans of the buttons as the steering wheel obscures their location and make it a bit fumbly to slide your thumb into position. A really important feature for 2020, diesel models add an engine after-run feature. Should you tow up a grade and park for dinner without a cool-down, the truck will do it for you. Run time is limited by temperature and shutdown is equally automatic. Because of the Allison/GM 10-speed transmission used for 2020, the powertrain required a complete recalibration. There are several positive results, according to David Ames, GM assistant chief engineer and Allison liaison. “Emissions have been improved and fine-tuned to maintain the best efficiency the transmission can offer to our customers.” It also has a fully warranted chain-driven engine-speed PTO available from the factory. The new 10-speed’s torque converter has a lock-up clutch that is unique as it will lock up in first gear, even under max loads. So, if you're pulling 35,500 pounds, you can do a first gear launch and lock up right away, which helps get rid of heat. We asked David why this is important. “Normally in first gear you're under high torque and generating a lot of heat, which puts a lot of demand on the cooling system. Locking up gets rid of that heat. Also, the new transmission has a lower 4.5:1 first gear with four planetary gear sets and six clutches. We noticed the low gear and ten speeds on launches and while pulling the box trailer on the highway. Often in hilly driving you're downshifting to save brakes; with ten gears we held the right speed and best RPM, particularly with automatic engine braking. We did drive a Silverado 3500HD dually at max capacity; 35,500 pounds on a closed course: our US Army CDL permit has lapsed. The claim of off-the-line torque is spot on. What was most interesting was the 3500’s ability to resist being pushed about on turns and we did several random serpentine loops to see if we could find any significant push? Nope. Later, with “only” 17,000 pounds behind us we finally found a bit of trailer push, which required a deeply rutted dirt road and an off camber turn. Nothing the truck couldn’t handle, even with a journalist behind the wheel. Many of us wondered why the different transmissions for Heavy Duty trucks, why not just the Allison ten? We asked and, while suspecting that plant capacity utilization and raw costs have something to do with it, were told by Vincenzo Verino, the 3.0L Duramax global chief engineer “It’s really about what the transmission brings to the engine itself. With a wider torque band, the gas engine is well-matched to a six-speed, while the narrower torque band of the Duramax is better suited to a 10-speed.” In the battle for Heavy Duty supremacy, big numbers are thrown around to convince potential buyers of worth and value. We found these slides from Chevrolet’s presentation compelling, showing Chevrolet doesn’t always have the biggest power numbers, yet can deliver more real world competency than competitors. Faster to 60 with better towing capability, we’ll take that over a bigger number any day. And Chevrolet says every diesel dually will tow more than 30,000 pounds the 2500HD with 6.6L gas engine has a tow capacity of 17,400 pounds, up 18-percent, that’s good regardless altitude. There is much, much more to tell in future stories, like the no-cut removable fascia for winter snow plow installation and the covered fender-mounted engine heater outlet, use reports of the up-down power tailgate and the bed’s 12 fixed and 9 moveable tie-downs. There’s details on improved axles, locking rear differential, beefed-up prop shaft and 12-inch ring gear, stronger U-joints, class-exclusive SLA front suspension (“mandating a solid front axle for HD trucks isn’t a thing” according to the chief engineer Tim Herrick) and the list goes on. We expect to write several more stories about the new trucks, each specific to how you’d use the truck and with even more details. We have only scratched the surface.
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