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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.

    8.8k
    posts

  2. Modifications & Accessories

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

    11k
    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

1,791 topics in this forum

  1. Some GMC Sierra HD Units Will Need A Transmission Filter Replacement 1 2

    By Ozark Dually,
    • 23 replies
    • 5.7k views

  2. Upfitter for 2024 2500HD AT4, Denali

    By rjgvt,
    • 6 replies
    • 6.1k views

  3. 2024 Silverado HD ZR2 - Cognito 'Super Stock Kit'

    By dirtracer455,
    • 3 replies
    • 2.2k views

  4. 2020 Chevy 2500 HD WT not opening

    By Gabe montoya,
    • 0 replies
    • 599 views

  5. 2024 Sierra 3500 marker lights install

    By Arsoncop,
    • 3 replies
    • 1.3k views

  6. 2025 GMC Ultimate Denali 2500HD Infotainment Locked -up

    By Todds Tap Room,
    • 2 replies
    • 2.1k views

  7. 2500 vs 3500 Suspension

    By revrnd,
    • 4 replies
    • 2.2k views

  8. 2024 Silverado HD Custom parts interchangeability with 2020-2023

    By Ry Guy,
    • 3 replies
    • 2.3k views

  9. Remove SIM Card from 2020 Silverado 3500

    By RGDD,
    • 8 replies
    • 20.3k views

  10. Rear Bumber swap

    By itismedavidg,
    • 0 replies
    • 613 views

  11. Spare tire ratchet tool

    By Hoginedgewood,
    • 6 replies
    • 5k views

  12. Power outlet 1 2

    By Los-0,
    • 26 replies
    • 79.9k views

  13. T1XX Trunnion Bushings

    By revrnd,
    • 7 replies
    • 921 views

  14. 2022 GMC SIERRA 2500 AT4 BRAKE SERVICE MODE

    By joeyjan,
    • 3 replies
    • 1.9k views

  15. 2024 2500HD AT4 engine randomly shutting down

    By 2500HDAT4,
    • 6 replies
    • 6.1k views

  16. 2024 GMC Denali Snow/Ice Mode?

    By SDDenali2024,
    • 5 replies
    • 5.5k views
    • Z45
    • Z45

  17. No RPO Code Sticker on 2024 Models

    By revrnd,
    • 9 replies
    • 7.4k views

  18. GM wheels and center caps

    By rjgvt,
    • 6 replies
    • 13.2k views

  19. Exhaust Brake

    By bharris515,
    • 14 replies
    • 35k views
    • Dunn
    • Dunn

  20. New 2024 GMC duramax 2500 (first Diesel and bit terrified tbh)

    By Dunn,
    • 10 replies
    • 3.5k views
    • Dunn
    • Dunn

  21. TMPS sensor for 2024

    By OS RR,
    • 1 reply
    • 589 views

  22. Question about 21-23 off road high clearance steps

    By juliaoakes,
    • 1 reply
    • 925 views

  23. Ordering 2025 GMC Hd

    By dlockwood26,
    • 3 replies
    • 1.9k views

  24. Seat Covers 1 2

    By rdonarski,
    • 18 replies
    • 14.7k views

  25. 1st 500-miles review - Please let me know if you share any of these issues! 1 2

    By Brianb33,
    • 16 replies
    • 6.4k views
    • Dunn
    • Dunn

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