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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. Moving/adding center stack switches '22 2500HD

    By Nodakrider,
    • 1 reply
    • 1.1k views

  2. Suspension Torque Specs - Cognito Leveling Kit

    By VermontL5P,
    • 3 replies
    • 1.5k views

  3. 2022 GMC Sierra 1500 and others BCM footwell lighting pinout - Denali Doorsill Install Info 1 2 3 4 6

    By zippydoda201,
    • 84 replies
    • 54.3k views

  4. 220 amp alternator 1 2

    By Chebbyfan,
    • 22 replies
    • 6.2k views

  5. Order time 1 2

    By 64BAwagon,
    • 22 replies
    • 2.1k views
    • Z45
    • Z45

  6. Headlight Control In Campgrounds

    By jake111,
    • 5 replies
    • 1.1k views

  7. Is this a new technique for criminals to gain access to interior of new trucks? 1 2

    By tonto340,
    • 19 replies
    • 3.7k views

  8. 2026 HD paint colors 1 2

    By 64BAwagon,
    • 18 replies
    • 13.3k views

  9. Changing the banner to read 2020-2026 HD

    By 64BAwagon,
    • 8 replies
    • 1.1k views

  10. Regular Cab vs Crew Cab Doors

    By AndrewF,
    • 9 replies
    • 6.4k views

  11. Build Sheets / Codes

    By A Jackson,
    • 4 replies
    • 2.1k views

  12. Catch Can 2024 2500 HD 1 2

    By BCGM,
    • 21 replies
    • 7.7k views

  13. 2024 2500 HDs With True North Pkg Question

    By revrnd,
    • 11 replies
    • 2k views

  14. 2020 2500HD vs 3500HD ride quality? 1 2

    By MrChips,
    • 18 replies
    • 25.1k views

  15. Does anybody else hate their seat? 1 2 3 4 5

    By edgexcsp,
    • 62 replies
    • 39.8k views

  16. 2024 Tow Mirror Trim Question

    By revrnd,
    • 2 replies
    • 969 views

  17. New Duramax rumor?

    By XY74,
    • 13 replies
    • 4k views

  18. Trouble Shifting (shuddering/drops power) around 45mph on light acceleration

    By uh33nowit,
    • 4 replies
    • 2.4k views

  19. thump when stopping

    By kylant,
    • 2 replies
    • 983 views

  20. Brakes soft 1 2 3

    By nards444,
    • 32 replies
    • 43.4k views

  21. Surround Vision Options

    By stephen.hancock83,
    • 3 replies
    • 3k views

  22. 2023-2024 6.2 failures

    By Srode1,
    • 2 replies
    • 1.1k views

  23. SAE J2807 2022 2500 HD

    By dquest,
    • 8 replies
    • 1.8k views

  24. Navigation update 1 2

    By GMC4Zee,
    • 15 replies
    • 2.6k views

  25. Grill Change on 2020, 2500HD

    By 57al,
    • 10 replies
    • 11.8k views
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