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Found 1,035 results

  1. Hi everyone, so recently I installed a sub/amp setup in my 2018 Sierra SLT Crew Cab. My truck has the 6 speaker BOSE without sub (no console/no sub). We tapped into the rear speaker wire for a signal to an Audiocontrol LC2i. I am noticing that certain frequencies are causing the bass to drop out. It seems like when there is a heavy bass line or kick, while also a singing voice/higher frequency sound, they are competing and ultimately the bass will drop out. Most instrumental music sounds great in the truck, the bass loss is only occurring when there other certain frequencies playing simultaneously. The bass will drop out/go really low, then the next hit will be normal (loud) when the frequencies are no longer competing. I am wondering if this is normal with the LC2i or if something else is causing this issue. Sorry if this explanation sucks...in a nutshell, any bass enthusiast will be able to notice this as soon as they got in my truck. The bass is not consistent and it is super annoying when it drops in and out. (For Ex. the same kick drum will hit at different levels throughout the same song depending on which other sounds are occurring at the same time) Thanks for any replies in advance, I appreciate it. - KJ
  2. I'm looking to buy a painted oem front bumper that doesn't have parking sensors. I have a 2014 GMC Sierra SLT with the chrome front bumper with parking sensors. I was wondering if anyone has drilled an OEM bumper and put in OEM parking sensors? I'm thinking this will be straight forward and shouldn't pose any problems?
  3. 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.”
  4. Hello all, I have recently purchased a 2017 GMC Sierra SLE Crew Cab, I have a question based on the package after I have done some research on it. With the badges it has on it and the packages the sales guy said it has per those packages I am questioning the ability to have that many on a vehicle. I am hoping someone can help me know if it is real or not. List is below. 1. SLE 2. Kodiak 3. Elevation 4. Z71 5. All Terrain
  5. Anyone running a 6.5" Lift with 35's OR a 4.5" lift? Anyone have measurements? Wheel well, roof, front/rear bumper? I haven't seen many people discussing their overall heights.
  6. Zane Merva Executive Editor, GM-Trucks.com 3/5/2018 With the debut of GMC's all new and very fancy MultiPro Tailgate last week in Detroit questions have been floated regarding various aspects of the design and how available the tailgate will truly be. So, we reached out to GMC directly and have some answers for you. Here we are in no particular order: Will the MultiPro be available on any trim level other than SLT and Denali? YES. Although only the SLT and Denali trim levels were mentioned last week, we can confirm the MultiPro tailgate will be available on the SLE trim level as well. Can I open the MultiPro with the keyfob? YES. Just the tailgate as a whole, however. There's no option to open the inner section unless you do it with the button on the gate. Will the MultiPro prevent itself from opening into mounted ball hitch? NO. This is the biggest issue we can see with the MultiPro going forward. The inner gate is fully susceptible to damage from a mounted trailer hitch. GMC does mention that a warning sticker will be present to remind owners not to do just this. Owners will have to remember going forward that if they leave a ball hitch mounted, the MultiPro WILL HIT IT. Will GMC offer a manual (cheaper) version of the MultiPro later on? UNDETERMINED. GMC wouldn't answer our questions about a cheaper, manual version of the MultiPro in the future. We think it would be a great idea and GMC punting the question means the option is in play for the future. Will Chevrolet ever get the MultiPro? LIKELY. Although no-one from Chevy is talking, we expect the Silverado to get the MultiPro (or a Chevy-named version) at some point in the near future, perhaps in model year two (2020)
  7. Hello Ladies and Gents Got a 2014 single cab L83 Sierra. I've recently acquired the following parts and I'm currently having them fit on to later be put on for a dyno tune... What do you guys reckon I'll put out on the dyno? What max RPM do you recommend I ask the tuner to go with? What should my further installs be? Adding: GPI stage 2 cam (stock converter) L86 intake and TB CAI Long tube 1 7/8 headers, 3 inch piping to a magnalfow muffler and out And finally a dyno tune... Thanks
  8. Planning on leveling my 2018 GMC Sierra 1500 with the MotoFab front 3" and rear 2" leveling kit. Planning on fitting 33" inch tires on my truck after. Trying to decide if I want 18" wheel rims or 20" wheel rims.. so if you could post pics of your trucks that would be great. Thanks!
  9. Planning on leveling my 2018 GMC Sierra 1500 SLE with the 3” front 2” rear MOTOFAB leveling kit. Currently have stock wheels/tires on it which are 255/70R17. Thinking about jumping up to 18” wheels instead but wanted to know how much of a difference the 17” to 18” jump would make in appearance. I was able to find plenty of pictures with 18” wheels but are there any photos out there of leveled /lifted trucks with 17” rims?
  10. Hey everyone! Welcome to this Tonneau Cover thread. Looking to purchase another Tonneau Cover for my 2018 Sierra 2500HD. I know there are a few sites but wondering where you guys have purchased in the past and where to find the best deals? I've been hearing that http://www.TonneauCovers.com has really good daily deals and generally cheaper prices for covers. Let me know where you guys have found the best luck!
  11. On Sunday March 8th I was driving my Sierra home from my parents-in law. I pulled out from a stop sign and was just getting up to speed when there was a loud bang followed by loss of power, Loud ticking noise, vibrations and a sulfur smell coming from the exhaust. I knew this was lifters instantly as it Happened to me in August of 2018, a short 11,000 miles ago. So, I took it in to my dealer who ran diagnostics and gave me the news That I would need lifters replaced yet again. Unfortunately, my power train warranty ran out December of 2019, so they told me I would owe a balance of $2900+ tax. Of course I was very upset with this news as I would have imagined the dealer would talk to GM and get this issue sorted out.. I mean it was only a few months over a year and less than 11,000 miles since they replacedall of the lifters and the cam shaft. I contacted GM myself and over the course of the last week have been working with the dealer and trying to talk to someone at GM who could help. Finally I reached a “senior analyst” who is apparently the top tier of customer assistance and she told me there was absolutely nothing they can do and I am responsible for the entire bill. I insisted that GM must know about the issues this engine has By now and should acknowledge and help their clients, but she offered no help. How can I trust this engine again? I have read many posts people have put on this forum alone with this issue of failing lifters. How can anyone be expected to pay this much for an issue that is derived likely from GMs design of the afm system? Especially after we pay $50,000+ for the truck to begin with! I do not pretend to be an Mechanical or financial expert, but I feel I have been severely wronged in this situation. I have no choice but to eat this cost and sell the truck before the lifters have a chance to fail again. I would suggest anyone doing research considering buying one of these trucks (I believe Sierra and Silverado 14-18 at least) that has the active fuel management system to rethink it. I would also go out on a limb and suggest my friends with 14-15 year Silverado and Sierras (with expired powertrain warranty’s) to consider selling them before the lifters fail on yours and you are stuck with a $3000-$5000 bill. Good luck all.
  12. Similar to the 18" post, I want to see a thread with a 100% stock setup and what size tires you put on for 20" stock wheels only. This thread is not for leveling kits or aftermarket wheels. Post up some pictures! Let us know what size your tires are and what kind. I'm really only interested in doing very minor trimming if needed. My last truck I just had to zip tie the liner a little further back. Thanks! My current stock AT4
  13. Looking to upgrade the stock wheels and tires on my '19 Sierra 1500 (extended cab, 4WD). I can get away with just blocks if I go with 33" tires, but need a lift if I go to the 35" tires. I don't want rubbing...but also don't want to get too aggressive on the lift. It is suggested that I go with a 6" lift. I don't do any offloading and I'm not trying to "act" like I do. I just love the look of the bigger whee/tire on this truck. Looking for suggestions from those who went with the 33" tire vs the 35" tire and what size lift you used (if you went with the 35" tire). Just throwing this out there so I can get some feedback from those who have already "figured it out." Thanks all!
  14. I have an 04 gmc Sierra Wt with a weird issue. it started when my battery went bad. i use the intermittent pin in the body-12 way-brown in the cab fuse block as an ignition driven accessory. the first thing i noticed was the accessory would only work every now and then. next the blower stopped working, the abs and brake likes came on, all at the same time. after messing with it all day here is the current issue. the abs and brake like come on when the blower speed control it set to any speed other then 0. when set back to 0 the abs and brake lights will turn off. the intermittent pin on the body-12 way-brown has low voltage and cant power my accessory. the constant power pin next to the intermittent pin has full 12 volts. I have checked every fuse and cleaned the ground on the forward driver side and the ground in front of the driver side suspension. I have also added 3 ground wires cab to battery frame to battery block to battery I am at a lose for what to do. Could it be a bad relay?
  15. Current truck, bought at 60k miles, currently have 95, whipple 2.9 installed at 76k , current issue p0324. No other codes, loss of power, garbage gas mileage, suspect either knock sensors or pcm as that's the only thing I can find on this topic. I have zero noise coming from the engine and still achieve 13 psi from the blower. Not losing coolant, or oil. Loss of power obviously coming from the car pulling timing as it's in a safe mode. Just need advice on whether or not it's going to be the pcm or the knock sensors themselves. Any advice would be appreciated. Btw the truck is strictly 93 octane.
  16. After 1 month of owning my new 2019 AT4 without any issues, I had the Nav SD card not installed error. The next day, the nav system went through s long loading process. Since then, with every vehicle startup, I now have a 10-25 second process of the nav system loading before it can be used. Previously, it was always nearly instantaneous. Also, the radio will be randomly self-muted. I brought it to the dealer last week and they did an infotainment system software update claiming to have fixed the problem. Nope, it’s still taking 10-20 seconds to load navigation and the radio was muted this morning. Anyone with 2019 Sierra AT4’s or Denali’s noticing a change in navigation loading, specifically now seeing loading screens where there haven’t been before? Is this just normal Nav function and somehow, for some reason, I just didn’t have it happen or didn’t notice it the first month? Could GMC pushed an OTA update that now cause the Nav to take longer to load?
  17. Working on 2014 GMC Denali, lost all control of windows from driver door master switch. Purchased new switch, no change, found (green/yellow) wire snapped in accordian sleeve between door. Spliced wire at each end of harness and ran new wire. Now have control of every window BUT my driver door.
  18. I was towing my 24' boat with my 2014 GMC Sierra truck in 2 wheel high (I rarely use 4 wheel drive). Unknowingly, it slipped into 4 wheel drive as I'm driving 65 + miles per hour on a dry highway. I finally realized something was wrong as I noticed an unusual humming noise and I could smell oil burning? A repair shop told me the truck was in 4 wheel drive and the front left gear oil must have overheated causing it to spew out (causing the burning oil odor). Their inspection also revealed that the front left gear box bearing was damaged and loose; obviously damaged due to loss of gear oil! The repair guy told me that he had seen this problem before! Makes me wonder if it is a defect with the GMC? Has anyone ever experienced, or heard, about this problem occurring with a GMC?
  19. We are upgrading to a 2020 GMC AT4 HD 3500 and should be delivered soon. Asking $47,000 Follow this link for additional photos Facebook Marketplace ad So...Look no further for your next tow vehicle! Tow in style, tow with confidence!! This 2015 GMC Denali HD 2500 in Black Onyx has all the bells and whistles and more! She has only 52500 miles on her! This truck has been upgraded with BlueOx Gooseneck Hitch, a Second 7 Way connector in bed to secure your Gooseneck or Fifth-Wheel camper trailer wiring harness to help you tow in comfort and with confidence. It has also been upgraded with a Pop-A-Lock remote lock actuator for tailgate (unlocks tailgate when you unlock your truck). To help with those horrible GM headlights, this Denali has been upgraded with GTR Lighting Gen 5 HID 5000K headlights and Morimoto XB LED foglights...I cannot begin to tell you how much of a difference this has made! For just that little bit of oomph or MPG, this GMC has also been upgraded with the Banks Ram Air intake and Banks exhaust with chrome tip. Upgraded Shocks to BILSTEIN 5100 series shocks at 43500 miles. A Banks AutoMind programmer, is available and negotiable with purchase of this 2015 GMC Denali HD.
  20. Did you know you can upgrade your gauge cluster in your 2014-2020 Silverado or Sierra? We recently did just that on our 2019 Silverado LTZ which came from the factory with a "mid-level" gauge cluster. Click here to read our review of the White Automotive and Media Gauge Cluster Upgrade https://www.gm-trucks.com/white-automotive-upgrade-heres-how-to-add-a-digital-gauge-cluster-to-your-silverado-or-sierra/
  21. The LED lights in the passenger side headlight of my 2016 Sierra 1500 Crew Cab are sporadically not working. Sometimes the are on, sometimes they aren't. The driver side functions properly all the time. The main light in the center of the headlight works fine all the time. I took it to the dealership and they replaced the whole headlight. When I turned on the truck a few hours after I picked it up from the dealership the LED lights were not working again. Has anyone had or heard about this issue? I'm going to take it back to the dealership, but would love some advice from anyone else that has dealt with this issue. Thanks!
  22. Is it possible to fit a rear flip kit from a 94 Sierra c1500 onto a 94 k2500 Sierra? If not can someone tell me if ways I can lower my k2500!
  23. I've been hearing a lot of horror stories about GM power steering doing some wacky things, is this something I need to look into or have I just been online too long? Hearing about power steering loss and sometimes electronic steering that randomly jerks while driving is quite frankly pretty scary especially when you're driving inches beside a semi truck on the highway. Is this something I need to worry about in my 2018 Silverado or is it just the one in a million trucks with this issue. Would appreciate some input on this. Thanks, Victor
  24. Item: 2016+ GMC Sierra Grille (Black) Condition: Brand New OEM Location: St. Louis, MO Description: Professionally painted GMC Sierra Grille that is a brand new take-off from an Elevation trim Sierra. It's factory matched to the Onyx Black paint code. I decided to go with a different grille and have this in the factory box. Price: $750 OBO (shipping to continental US included) See attached pictures.
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