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  1. Next-Generation GM Trucks (2027+)

    1. 2027+ Silverado 1500 & Sierra 1500

      The definitive source for the next-generation 2027 Chevrolet Silverado and GMC Sierra. Breaking news, spy photos, release dates, and technical discussion on the redesigned platform.

      479
      posts

    2. Gen VI Small Block V8 (5.7L & 6.6L)

      The next chapter of GM performance. Discussion on the 5.7L and 6.6L Gen 6 Small Block V8 displacements for the 2027 Chevrolet Silverado and 2027 GMC Sierra.  Talk specs, technology, and the $854M investment in the future of the V8.

      47
      posts

    3. 2.7L TurboMax Engine

      The ultimate resource for the 2027+ GM 2.7L TurboMax featured on the Chevrolet Silverado and GMC Sierra. Connect with other owners to discuss the enhanced power delivery, towing capability, and the brand-new 10-speed transmission.

      6
      posts

    4. ZR2, Trail Boss, AT4, AT4X & AEV Off-Road

      Discuss the 2027+ Silverado ZR2, Trail Boss, Sierra AT4 & AT4X. Get technical info on GM's factory 2-inch lift, 34" and 35" MT tires, Multimatic DSSV dampers, and AEV Bison editions.

      • No posts here yet

    5. 3.0L Duramax Turbo-Diesel

      The premier community for the 2027+ Silverado and Sierra Duramax 3.0L Turbo-Diesel. Explore technical details, towing numbers, and maintenance for this proven, segment-exclusive powertrain.

      • No posts here yet

  2. GM Electric Vehicles (Ultium)

    1. Silverado EV & Sierra EV

      The full-size electric trucks. Discussion for the Chevrolet Silverado EV (WT, RST, Trail Boss) and GMC Sierra EV (Denali, AT4, Elevation). Covers range, towing, and charging.

      68
      posts

    2. GMC HUMMER EV

      The world's first supertruck. Discussion for the Hummer EV Pickup (SUT) and SUV. Off-road modes, CrabWalk, and mods.

      320
      posts

    3. Equinox EV, Blazer EV & Cadillac Lyriq

      The technical resource for GM's electric crossovers. Discussion on the Chevy Equinox EV, Blazer EV, Cadillac Lyriq, and Optiq. Share software tips, range tests, and charging experiences.

      • No posts here yet

  3. 2019+ Full-Size Trucks & SUVs (T1XX Platform)

    1. 2019-2026 Silverado 1500 & Sierra 1500

      The main discussion hub for the T1XX platform. Daily driving, new orders, pricing, and news for the 2019+ half-ton trucks. Includes 2022+ refresh. 

       

       

      205.6k
      posts

    2. 2020-2026 Silverado HD & Sierra HD

      The heavy-duty headquarters. Discussion for the 2500HD and 3500HD. Towing, payload, ordering, and daily driving.

       

       

      53.2k
      posts

    3. 2021-2026 Tahoe, Suburban, Yukon & Escalade

      The full-size SUV headquarters. Discussion for the Chevy Tahoe/Suburban, GMC Yukon/XL, and Cadillac Escalade. Covers the 3.0L Duramax, 6.2L V8, Air Ride suspension, and IRS upgrades.

       

      1.6k
      posts

  4. Chevy Colorado & GMC Canyon Forums

    1. 2023+ Colorado & Canyon (3rd Gen)

      Discussion, news, and technical help for the 2023+ Chevy Colorado and GMC Canyon. Covers the 2.7L TurboMax engine, ZR2, AT4X, and all 3rd Gen updates

      151
      posts

    2. 2015-2022 Colorado & Canyon (2nd Gen)

      The central hub for the 2nd Generation twins. Discussion, news, and ownership experiences for the 2015-2022 Chevy Colorado and GMC Canyon.

      3.6k
      posts

    3. 2004-2012 Colorado & Canyon (1st Gen)

      The original GMT355 platform. Technical discussion and mods for the 2004-2012 Chevy Colorado, GMC Canyon, and Isuzu i-Series. Also covers the Hummer H3 & H3T.

      449
      posts

  5. 2014-2019 Full-Size Trucks & SUVs (K2XX Platform)

    1. 2014-2018 Silverado 1500 & Sierra 1500

      The main discussion hub for the half-ton K2XX. Includes the 2019 Silverado LD and Sierra Limited legacy models 

      621.5k
      posts

    2. 2015-2019 Silverado HD, Sierra HD & Medium Duty

      The heavy haulers. Discussion for the 2500HD / 3500HD and the 4500HD / 5500HD / 6500HD chassis cabs.

      42.6k
      posts

    3. 2015-2020 Tahoe, Suburban, Yukon & Escalade

      The K2XX SUV family. Discussion for the Tahoe/Suburban, Yukon/XL, and Cadillac Escalade. Covers Magnetic Ride Control and Air Leveling.

      13.3k
      posts

  6. 1999-2013 Silverado & Sierra (GMT800 & GMT900)

    1. 1999-2013 Silverado 1500 & Sierra 1500

      The daily drivers. Discussion for the half-ton GMT800 and GMT900 trucks. Troubleshooting 4WD, ABS modules, and rocker panel rust


       

      139.7k
      posts

    2. 2000-2014 Silverado HD & Sierra HD

      The workhorses. Discussion for the 2500HD and 3500HD heavy-duty trucks. Covers the 2014 HD transition year.

      29.3k
      posts

  7. GM Crossovers & SUVs

    1. 2025+ Chevy Equinox & GMC Terrain

      The all-new generation. Discussion for the 2025 Equinox (LT, RS, Activ) and 2025 Terrain (Elevation, AT4, Denali). Focus on the new rugged styling and Google Built-In technology.

      11
      posts

    2. 2024+ Traverse, Acadia & Enclave

      The new generation of 3-row haulers. Discussion for the 2024+ Chevy Traverse (Z71/RS), GMC Acadia (AT4/Denali), and the all-new Buick Enclave. Tech talk for the 2.5L Turbo-4 and Super Cruise.

      13
      posts

    3. Classic Equinox & Terrain (2005-2024)

      Discussion and technical help for previous generations of the Equinox and Terrain.

      6
      posts

    4. Traverse, Acadia, Blazer & Enclave (Pre 2024)

      The mid-size and 3-row headquarters. Technical discussion and news for the 2023 and older Chevy Traverse, Blazer, GMC Acadia, Buick Enclave, and Cadillac XT5/XT6.

      521
      posts

  8. Classic Chevrolet & GMC Pickup Truck Forums

    1. Chevrolet Express & GMC Savana

      All topics related to Chevrolet and GMC's popular full-size van line.

      389
      posts

    2. 1988-1999 Chevrolet & GMC C/K GMT400 Platform

      Like a rock. The classic 90's pickup truck. General and technical discussion for 1988 through 1999 Chevrolet and GMC pickup trucks. Parts wanted and for sale encouraged.

      13.9k
      posts

    3. 1980-2009 Chevrolet Kodiak and GMC Topkick

      Discussion for the medium-duty commercial Kodiak and Topkick.

      225
      posts

    4. 1973-1987 Chevrolet & GMC Square Body / Rounded Line Pickups

      General and technical discussion for 1973 through 1987 Chevrolet and GMC pickup trucks. These years were otherwise known as "square body" pickups, although GM officially called them "rounded line" designs. Parts wanted and for sale encouraged.

      1.5k
      posts

    5. 1967-1972 Chevrolet & GMC Glamour / Action Line Pickups

      The transition from work transportation to personal vehicle. General and technical discussion for 1967 through 1972 Chevrolet and GMC pickup trucks. Parts wanted and for sale encouraged.

      321
      posts

    6. 1960-1966 Chevrolet C/K/Apache & GMC 1000-3000 Pickups

      The beginning of the modern age of the pickup truck. General and technical discussion for 1960 through 1966 Chevrolet and GMC pickup trucks. Parts wanted and for sale encouraged.

      124
      posts

    7. 1982-2005 Chevrolet S-10/Blazer & GMC S15/Sonoma/Jimmy

      1982-2004 Chevrolet S-10 & GMC Sonoma, 1983-2005 Blazer & Jimmy

      1.6k
      posts

    8. 1969-1994 Chevrolet K5 Blazer & GMC Fullsize Jimmy

      The smallest full-size SUV in the history of Chevrolet and GMC. The original two-door station wagon. Discussion for the classic 1969 through 1994 K5 Blazer and fullsize Jimmy.

      169
      posts

  9. Member Builds & Introductions

    1. Member Build Threads

      The transformation from stock to custom. Document your build, modification by modification. One thread per truck.

      20.5k
      posts

    2. New Member Introductions

      Are you a new member? Maybe a member who's never posted anything before? It's alright! Come on in, start a new thread, and introduce yourself.

      24.9k
      posts

  10. Technical & Advanced

    1. Ask A GM Technician

      Stumped? Post your question here for GM Master Techs. Serious inquiries only. Please include your VIN and codes. 

      29.8k
      posts

    2. Towing, Hauling & Hitches

      Payloads, 5th wheels, and weight distribution. Ensure your truck is rigged right to pull the load.
      8.4k
      posts

    3. Audio, Electronics & Software

      The digital dashboard. Discussion on Google Built-In, Apple CarPlay, Android Auto, OnStar, and aftermarket sound systems.

      12.3k
      posts

    4. Tires, Wheels & TPMS

      Fitment guides and rubber reviews. KO2 vs. Wildpeak? Chrome vs. Black? Discuss universal tire and wheel topics here.

      16.1k
      posts

    5. Maintenance, Oils/Fluids, Detailing & Rust Prevention

      From the engine bay to the paint booth. Discuss oil analysis, fluid intervals, ceramic coatings, car wash techniques, and fighting rust. Keep your truck running strong and looking showroom fresh.

      20.4k
      posts

    6. Advanced Drivetrain, Suspension & Tuning

      Deep dives into mechanical theory. Gear swaps, transmission rebuilding, solid axle swaps (SAS), and HP Tuners / ECU calibration.

      16.2k
      posts

    7. DIY Guides & Reference Library

      Installations, Maintenance, and Repairs.

      2k
      posts

    8. Article & Review Archive (Pre-2019)

      A legacy collection of GM-Trucks.com original news, road tests, and product reviews published prior to 2019.

      14.6k
      posts

  11. Marketplace & Purchasing Advice

    1. Classifieds (Buy/Sell/Trade)

      The trading post. Buy and sell trucks, parts, and accessories. Please use caution and follow listing rules.

      55.4k
      posts

    2. Dealerships, Pricing & Orders

      Getting a good deal? Discussion on OTD pricing, interest rates, dealer markups, and order tracking.

      4k
      posts

    3. Vendor & Product Reviews

      The good, the bad, and the ugly. Reviews of aftermarket parts and experiences with forum vendors.

      1.3k
      posts

  12. The Lounge & Lifestyle

    1. The Off-Topic Bar

      Sports, news, jokes, and life. If it doesn't fit anywhere else, it goes here. (Keep it civil).

      94.1k
      posts

    2. Future GM News & Rumors

      General industry news, spy shots of non-truck GM vehicles, and rumors about what's coming next.

      11k
      posts

    3. Racing, Strip, & Track

      Track talk, racing strategies, super-performance parts, and techniques.

      1.5k
      posts

    4. Garage, Shop & Tools

      The place for projects. Snow plowing, landscaping, tools, garage heating, and home improvement.

      3.4k
      posts

    5. Hobbies, Tech & Outdoors

      Hunting, fishing, 3D printing, and photography. The place for your other passions.

      11.6k
      posts

    6. The GM-Trucks.com Garage - Vehicle Testing & Product Reviews   (18,922 visits to this link)

    7. General Motors Product and Industry News   (21,555 visits to this link)

    8. Meetups, Events, & Gatherings

      Connect with other GM-Trucks.com members around the US or around the world.

      3.2k
      posts

  • Latest Articles

  • Posts

    • davester
      My First Project and GMC has me stumped

      By davester · Posted

      are there any codes? with lots of rust, perhaps disconnect/clean both sides of the connection/examine cable ends (the wires) for corrosion going into the sheath & replace if necessary/reconnect ALL the power AND ground cables between the battery, engine, frame, cab, fuse box and starter charm.li (website) has a no-start diagnostic procedure you can work through to get it working.
    • Chuck FB
      OCI, not when but why?

      By Chuck FB · Posted

      Its no wonder you've gravitated to the oil types and brands you have in later years after trying certain brands and one being a specialty oil or at least very hard to come by up here and the other would have been a commonly found oil of the era and the vastly different outcomes as a result to using the vehicles in question the same distance for an OCI . It shows what marketing hype can do without actually having the product to back up the claims and that is no different now with the insane claims that are written on the side of a bottle of oil from some of the off the shelf oils.    What has surprised me and I was already finding this out before I bought my truck with the GDI engine, that this newer fancy technology that seemingly would suggest better fuel economy/emissions with this high pressure spray of fuel is not in reality kind at all to the engine or at least the oils life. Yet they insist on claiming long OCI with this technology just like they did with the port or similar type fuel injection systems when in reality its a step back in oil life to have a GDI system.    I think the mistake your making Grumpy is that your not sending your samples to Blackstone and getting the feel good glowing report that you can run it another 1000 or more miles and then send another sample where they say run it yet another 1000 miles and on and on it goes until your sending in something that looks a lot like road tar and then they may suggest you change your oil within the next 1000 miles 😆
    • Chuck FB
      OCI, not when but why?

      By Chuck FB · Posted

      I am guessing that engines of that design back then had a better ability to be abused and survive longer than a new design engine with the long timing chain and the overhead cams and phasers etc. But I would never guess that an engine could go that far and not fail spectacularly or at least die a slow death. 
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      In the 80's 90's I'd run Honda's 7,500 miles between changes using Red Line HP 5W20 and do it for hundreds of thousands of miles with issues. Back in the day it was an SAE 20 with the HTHS of a SAE 30 and SN add load. It was also very polar. Oxidation VOA was over 120. Besides those motors were SPFI and lean burn tech. I could have likely run it longer but never did.    We had a Toyota bought new I ran on Pennzoil's latest and greatest synthetic of the day with "Penthane". A made up word for a very low dose of PAO. Tried 7,500 mile OCI's in that Group III/VI chemistry and the rings tapped out at 90K. Rocker box wasn't as bad as the one Punch put up but it wasn't good either. Also a SPFI motor.    I'm around 3,750 across the board on these GDI monsters and the oil it tapped out by then usually on TBN/TAN crossover and color. Red Line HP Euro.    The AMSOIL SS brochures tell you to follow the OEM values for the service class but that it can be run up to 25K if monitored. I can't imagine what motor could go that distance and not tap out. I've never owned one.    Yes, I know. Lot's of people do. I'm just not going to be one of them. 
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      I knew a guy in the early 80's that bought a new Monte Carlo and ran it a 100,000 miles without ever changing the filter or the oil. Just kept adding. It looked like that inside.     

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