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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. trailer tire tpms range

    By BobW38,
    • 2 replies
    • 3.1k views

  2. Loaded LT vs LTZ

    By Merc0085,
    • 13 replies
    • 11.6k views

  3. Trim Height Z Measurement

    By Wxman,
    • 3 replies
    • 904 views

  4. AT4 and 5th Wheel towing

    By xETERNALx,
    • 12 replies
    • 10.5k views

  5. Anyone unhappy with WT trim? 1 2

    By nick112288,
    • 23 replies
    • 3.9k views

  6. 2022 HD Ordering Guides are LIVE!

    By newdude,
    • 2 replies
    • 4.6k views

  7. Gas vs Diesel Cost of Ownership 1 2 3 4

    By CaptainMorganNC,
    • 59 replies
    • 48.7k views

  8. Trade In Value 1 2

    By NCCaptainMorgan,
    • 16 replies
    • 3.8k views

  9. Def Fluid Gage

    By LarryP,
    • 5 replies
    • 1.4k views

  10. Oil drain plug/Valve

    By Laidback,
    • 0 replies
    • 780 views

  11. Just ordered Hope I dont regret it 1 2 3

    By nards444,
    • 31 replies
    • 7k views

  12. My order

    By 2021 HD,
    • 1 reply
    • 645 views

  13. Front Shock Bolt Torques

    By Wxman,
    • 0 replies
    • 793 views

  14. Hitch receiver choices

    By crf450r,
    • 11 replies
    • 13.5k views

  15. side view cameras

    By WildWill,
    • 3 replies
    • 1.1k views

  16. 6.6l Gasser

    By Robby23,
    • 9 replies
    • 3.9k views

  17. Factory parts for 2021 GMC 3500HD

    By John FX,
    • 3 replies
    • 1.4k views

  18. Low oil level in L8T but oil full on dipstick

    By Timu8,
    • 2 replies
    • 2.2k views

  19. 2nd alternator and battery

    By NCCaptainMorgan,
    • 1 reply
    • 1.2k views

  20. MyGMC app update

    By sdelam,
    • 2 replies
    • 1.2k views

  21. Someone make me a kit: 1500 front end on 2020 2500 1 2

    By ROOK Lucky 13,
    • 20 replies
    • 10.1k views

  22. Grade Braking??

    By Dusilligaf,
    • 11 replies
    • 12.2k views

  23. headliner removal?

    By JCunningham,
    • 6 replies
    • 13.9k views

  24. Thoughts on new HD Twins 1 2

    By wesd,
    • 15 replies
    • 3.1k views

  25. Folding or Hard Roll-up Tonneau Cover

    By NCCaptainMorgan,
    • 8 replies
    • 1.9k views
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