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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. What mileage are you guys seeing with 35’s???? Mine sucks! 1 2

    By gunner25,
    • 15 replies
    • 10k views
    • Z45
    • Z45

  2. My AT4 HD mods... 1 2

    By bharris515,
    • 15 replies
    • 13.1k views

  3. Thoughts on new HD Twins 1 2

    By wesd,
    • 15 replies
    • 3.1k views

  4. Check this out!! 1 2

    By Cheekster96,
    • 15 replies
    • 3k views

  5. Placing order! 1 2

    By docster,
    • 15 replies
    • 3.4k views

  6. Hitch Pin Weight 1 2

    By Steve T,
    • 15 replies
    • 26.2k views

  7. forced to disable my ad blocker to access this site 1 2

    By vucelick,
    • 15 replies
    • 1.8k views

  8. 2020 GMC AT4 Rear Leaf Spring Slap or Clunk Noise 1 2

    By ploughboy,
    • 15 replies
    • 11.3k views

  9. Brownstone metallic AT4?! 1 2

    By karam00,
    • 15 replies
    • 19k views

  10. Cost of mid tailgate for multipro?

    By SuperDuper,
    • 14 replies
    • 20.9k views

  11. cab height

    By Gary Wiles,
    • 14 replies
    • 14.6k views

  12. Interior

    By cmysstailights,
    • 14 replies
    • 6.2k views

  13. And here we go with the whole tail "gate" and "water gate" issue of it opening on its own!

    By Jettech1,
    • 14 replies
    • 5.3k views

  14. Realistic pricing at the dealership??

    By WhitProcter,
    • 14 replies
    • 5.4k views

  15. HUD stopped working

    By BDSW,
    • 14 replies
    • 30.8k views

  16. High beam and reverse light signal?

    By FirstAscent,
    • 14 replies
    • 11.8k views

  17. 2026 HD's?

    By C/K Man,
    • 14 replies
    • 23.9k views

  18. GMC branded Tonneau cover HELP!!

    By DeadManWalkin,
    • 14 replies
    • 4.3k views

  19. Delivery joke

    By HR3,
    • 14 replies
    • 2.3k views

  20. 2500 Gasser vs 1500 w/ 6.5' bed

    By trojanone1,
    • 14 replies
    • 2.2k views

  21. Adding a 2024+ gooseneck wiring plug

    By AndrewF,
    • 14 replies
    • 2.6k views

  22. Public parking woes

    By greatmizzou,
    • 14 replies
    • 10.9k views

  23. Hood latch recall

    By mkeddie,
    • 14 replies
    • 14.4k views

  24. torque management

    By kylant,
    • 14 replies
    • 4.9k views

  25. Hitch capacity 2020 Silverado and gmc towing tags

    By Formerorange,
    • 14 replies
    • 4.2k views

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