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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. Gooseneck hitch w/ 2500 HD standard bed prep package 1 2

    By heywalt,
    • 15 replies
    • 23.7k views

  2. 2020 2021 cab light measurements

    By camhead68,
    • 1 reply
    • 2.2k views

  3. Aero shutters and diesel winter cover

    By CRApex,
    • 8 replies
    • 17k views

  4. 2021 silverado usb is not recognized

    By lickyboomboom,
    • 0 replies
    • 341 views

  5. Just purchased '21 3500HD At4 1 2

    By paulny,
    • 17 replies
    • 6.2k views

  6. HUD stopped working

    By BDSW,
    • 14 replies
    • 30.9k views

  7. My TPW is next week

    By migrabill,   
    • 12 replies
    • 3.7k views

  8. Block heater question

    By BigKahuna,
    • 9 replies
    • 27.6k views

  9. New Member 2021 Silverado 2500HD (On-Order)

    By JakeFromStateFarm,
    • 3 replies
    • 2.1k views

  10. What is factory exhaust size on 6.6 gas trucks?

    By nomadicdogg,
    • 3 replies
    • 20.1k views

  11. Actual Payload 1 2 3 4

    By brclark82,
    • 50 replies
    • 42.5k views

  12. OEM Fog Lights for 2021 GMC Sierra 2500

    By lonman,
    • 3 replies
    • 12.4k views

  13. New 2500hd...wrong headlights? 1 2

    By jimbaeumel,
    • 22 replies
    • 5.8k views

  14. Trailer camera connector

    By XY74,
    • 0 replies
    • 928 views

  15. 2021 GMC 2500 AT4 w/6'10" Bed and factory puck system - Do I need a slider hitch?

    By Todd F.,
    • 0 replies
    • 663 views

  16. 20’ GMC HD 2500 Duramax AT4 winter grille cover

    By Peekaboo Bruizer,
    • 0 replies
    • 3k views

  17. Feb Incentives 1 2

    By agcntry,
    • 16 replies
    • 3.9k views

  18. Banks iDash Causing CEL?

    By Tomato,
    • 12 replies
    • 7.4k views

  19. My New Ride...

    By fly53usmc,
    • 10 replies
    • 2.2k views

  20. ordered it

    By crazydog,
    • 9 replies
    • 1.7k views

  21. Honest Comparison - 3500 RAM Cummins vs GMC DMAX 1 2

    By ArrowsmithPML,   
    • 25 replies
    • 15.8k views

  22. Towing with 37’s

    By GLMJR,
    • 7 replies
    • 40k views

  23. 2020 Chevy Silverado 2500 High Country Parts

    By VloneEd,
    • 1 reply
    • 1.1k views

  24. How long has it been taking to order a new truck? 1 2

    By Keith_Schumaker,
    • 25 replies
    • 15.4k views

  25. 2021 HD-- deciding if i want to trade

    By crazydog,
    • 5 replies
    • 2.1k views
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