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2020-2026 Silverado HD & Sierra HD

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

 

 

Subforums

  1. Troubleshooting, Warranty & Recalls

    The repair shop. Diagnose emissions codes, electrical issues, Allison transmission behavior, and recall updates.

    8.7k
    posts

  2. Modifications & Accessories

    Bumper replacements, 5th wheel hitches, auxiliary lighting, and suspension upgrades for your workhorse.

    10.9k
    posts

  3. 6.6L Duramax Diesel (L5P)

    The torque monster. Tuning, maintenance, and exhaust discussion for the L5P Duramax and 10-speed Allison transmission.

    2.2k
    posts

  4. 6.6L Gas V8 (L8T)

    The iron-block workhorse. Tech and reliability discussion for the 6.6L L8T V8 and the 6-speed / 10-speed heavy-duty transmissions.

    5.6k
    posts

1,787 topics in this forum

  1. New here.... considering a switch from Ford F-350 to GMC 3500 1 2 3

    By gascantx,
    • 34 replies
    • 30.9k views

  2. 2020 GMC AT4 Diesel Brakes lock up on their own. Extremely Dangerous!!! 1 2 3

    By joeidaho,
    • 42 replies
    • 30.9k views

  3. HUD stopped working

    By BDSW,
    • 14 replies
    • 30.8k views

  4. Cost of maintenance

    By 05 1500HD,
    • 10 replies
    • 30.7k views

  5. Tire load index rating

    By Spangled,
    • 9 replies
    • 30.7k views

  6. Adding Sub/Amp to bose system?

    By Wigg006,
    • 6 replies
    • 30.6k views

  7. 2021 getting Wireless CarPlay... 1 2 3 4

    By bharris515,
    • 52 replies
    • 30.2k views

  8. 2025 production start date 1 2

    By vucelick,
    • 16 replies
    • 30.1k views

  9. 2022 Greenstone/Forest Metallic (GHR)

    By KCJackson1,
    • 11 replies
    • 30k views

  10. Who has a plow? 1 2

    By deluter,
    • 25 replies
    • 30k views

  11. What rear and what locker are in the new HD's

    By 2021 HD,
    • 12 replies
    • 29.6k views

  12. No rear cup holders in 2021 2500 LT??? 1 2

    By ArkChevy,
    • 22 replies
    • 29.6k views

  13. Z71 package - effect on ride quality, ride height, and/or towing?

    By Alfa Georgia,
    • 14 replies
    • 29.5k views

  14. Programming Key Fobs

    By bruceb58,
    • 11 replies
    • 29.4k views

  15. 2500HD gas drops 4.10 gear option! what! dealbreaker!

    By markp210,
    • 13 replies
    • 29.1k views

  16. Dual alternator conversion?

    By FirstAscent,
    • 12 replies
    • 28.6k views

  17. Low fuel light

    By ROD123,
    • 4 replies
    • 28.4k views

  18. 0 to 60 with the gasser and Allison combo 1 2 3 4 5

    By Jettech1,
    • 71 replies
    • 28.3k views

  19. High Idle Option function Gas and Diesel Heavy Duty trucks 1 2

    By sheath,
    • 21 replies
    • 28.2k views

  20. What oil does the dealer use? I don't think he knows... 1 2

    By gmatx,
    • 15 replies
    • 28.2k views

  21. Diesel vs Gas cost to own comparison tool 1 2 3

    By Rozz522,
    • 35 replies
    • 28.1k views

  22. roof marker lights 1 2

    By kylant,
    • 23 replies
    • 28k views

  23. Auxiliary Accessory Trailer Camera (Connector)

    By patrickrivard,
    • 2 replies
    • 28k views

  24. Alternative to GM# 84876818 camera 1 2 3

    By Chevy350Z,
    • 37 replies
    • 27.8k views

  25. Block heater question

    By BigKahuna,
    • 9 replies
    • 27.6k views
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