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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

1,789 topics in this forum

  1. 2020 Silverado high country and trailer lighting

    By Ctslacker,
    • 1 reply
    • 672 views

  2. T1xx vs K2xx HD trucks

    By Pryme,
    • 1 reply
    • 667 views

  3. 2024 6.6 gas vibration and some other small things..

    By TeamSaris,
    • 4 replies
    • 666 views

  4. 2014 Chevy LTZ Running Light/Parking Light Driver Side

    By Marty McFly,
    • 3 replies
    • 664 views

  5. How To Unplug Center Stack Power Port?

    By Core-Lokt,
    • 1 reply
    • 664 views

  6. 2021 GMC 2500 AT4 w/6'10" Bed and factory puck system - Do I need a slider hitch?

    By Todd F.,
    • 0 replies
    • 661 views

  7. Discount Dealer on East Coast

    By bruceb58,
    • 0 replies
    • 658 views

  8. 2020 Silverado 3500 Dually High Country Taillights

    By crookedpat,
    • 0 replies
    • 644 views

  9. My order

    By 2021 HD,
    • 1 reply
    • 642 views

  10. What are these plugs?

    By kevin74,
    • 1 reply
    • 640 views

  11. Happy Birthday America!

    By sheath,
    • 1 reply
    • 637 views

  12. Looking for a good GMC dealer in NJ

    By mjribeiro,
    • 2 replies
    • 636 views

  13. 2020 HD Standard bed / 5'er Hitch

    By jjackkrash,
    • 1 reply
    • 633 views

  14. Trailer TPMS system

    By Sumrtime,
    • 0 replies
    • 631 views

  15. Doug owner

    By Jasman,
    • 1 reply
    • 628 views

  16. 3500HD AT4 gas owners?

    By Rory Blaze,
    • 1 reply
    • 627 views

  17. Got really lucky Saturday night not hitting bambie.

    By Jettech1,
    • 11 replies
    • 624 views

  18. Navigation

    By Z71RAD88,
    • 0 replies
    • 623 views

  19. Trade my 2020 3500HD LTZ Chrome parts for your Black work truck parts.

    By bizasuge,
    • 0 replies
    • 620 views

  20. hands free

    By crazydog,
    • 0 replies
    • 618 views

  21. 4 Wheel Drive System

    By GAMark,
    • 10 replies
    • 618 views

  22. Rear Bumber swap

    By itismedavidg,
    • 0 replies
    • 606 views

  23. Why No Elevation Trim In GMC’s HD Lineup

    By spizike9,
    • 0 replies
    • 599 views

  24. 2024 Silverado 2500

    By Baron Davis,
    • 0 replies
    • 597 views

  25. Help finding a part number

    By smokeyburnout,
    • 4 replies
    • 597 views
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