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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. First 1000 miles in the books

    By Leonardo Willi,
    • 3 replies
    • 1.3k views

  2. Did you pay the price agreed at order time

    By Fred32,
    • 2 replies
    • 1.3k views

  3. The 20" Factory Goodyears are finally starting to make some noise 1 2

    By Jettech1,
    • 16 replies
    • 1.3k views

  4. tailgate

    By crazydog,
    • 6 replies
    • 1.3k views

  5. 2024 GMC Denali ultimate accessories

    By Troy90,
    • 0 replies
    • 1.3k views

  6. .

    By 64BAwagon,
    • 12 replies
    • 1.3k views

  7. size

    By crazydog,
    • 9 replies
    • 1.3k views

  8. Few or Several

    By James Beyer,
    • 8 replies
    • 1.3k views

  9. Over the air update ...

    By Njmurvin,
    • 4 replies
    • 1.3k views

  10. Trailer average MPG vs Drive Summary

    By rjgvt,
    • 2 replies
    • 1.3k views

  11. Trading in the Custom HD for SLE HD...

    By Weatherby460,
    • 5 replies
    • 1.3k views

  12. High wheel option 20in Bolt pattern wheels and Standard

    By nards444,
    • 3 replies
    • 1.3k views

  13. 2024 Sierra 3500 marker lights install

    By Arsoncop,
    • 3 replies
    • 1.3k views

  14. 2024 GMC Sierra 3500 HD

    By john kari,
    • 4 replies
    • 1.3k views

  15. Floor Liner Question

    By revrnd,
    • 9 replies
    • 1.3k views

  16. High Country Question

    By revrnd,
    • 2 replies
    • 1.3k views

  17. Got this a few days ago.

    By STRUCTUAL_PE,
    • 4 replies
    • 1.3k views

  18. Tare weight

    By jl449,
    • 6 replies
    • 1.3k views

  19. Which Truck

    By James Beyer,
    • 10 replies
    • 1.3k views

  20. Considering 2018 F-350 to GMC 3500HD

    By Alan Peabody,
    • 4 replies
    • 1.3k views

  21. Dealer, Oil Change package.

    By marpel,
    • 3 replies
    • 1.3k views

  22. New truck day today!

    By XY74,
    • 8 replies
    • 1.3k views

  23. 2026 Silverado 2500 Surround Vision Recording?

    By mkirkland,
    • 4 replies
    • 1.3k views

  24. 2024 Sierra Order!

    By 2k19Sierra,
    • 0 replies
    • 1.3k views

  25. Tortion bars - Plow Prep Vs Standard

    By Steph 6.6 HD gas,
    • 1 reply
    • 1.3k views
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