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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. Dealerships 1 2 3 4

    By BCGM,
    • 47 replies
    • 5.1k views

  2. OIL REBATE

    By littleal,
    • 0 replies
    • 716 views

  3. New tires on 2500 Ultimate

    By Moyses,   
    • 1 reply
    • 1.7k views

  4. Dash panel removal 1 2

    By rjgvt,
    • 19 replies
    • 23k views

  5. Towing first 500 miles? 1 2

    By Mid-Night Rider,
    • 25 replies
    • 4.3k views

  6. Mirror upgrade

    By Jay96,
    • 13 replies
    • 20.9k views

  7. Locking Gas Door? 1 2

    By BigEdB,   
    • 21 replies
    • 62.4k views

  8. 2026 HD's?

    By C/K Man,
    • 14 replies
    • 24.1k views

  9. Retract Pro Max Tanau Cover fitting over the Fifth Wheel Hitch?

    By Mid-Night Rider,
    • 3 replies
    • 727 views

  10. 2024 / 2500 Crew Cabs Roofs Cracking

    By BCGM,
    • 10 replies
    • 1.8k views

  11. What kind of pig tail do I need for my 2024 Chevy 3500 HD?

    By Mid-Night Rider,
    • 6 replies
    • 1.1k views

  12. New 2024 Denali 3500 HD Gasser

    By Grjfer,
    • 11 replies
    • 4.3k views

  13. Purchase 2500 HD in Canada 1 2

    By BCGM,
    • 16 replies
    • 7.8k views

  14. Retract Pro Max Tanau Cover fitting over the Fifth Wheel Hitch?

    By Mid-Night Rider,
    • 0 replies
    • 517 views

  15. Rear Window with Larger Opening

    By SierraCamper,
    • 3 replies
    • 3.1k views

  16. 24 HD Seats

    By tonto340,
    • 4 replies
    • 8.4k views

  17. 2020 GMC Denali HD possible brake control module issue

    By Battery Frank,
    • 10 replies
    • 3.8k views

  18. Rustproofing

    By BCGM,
    • 8 replies
    • 2.2k views

  19. 3500 gmc not warning me

    By Mike Weinandy,
    • 9 replies
    • 1.4k views

  20. Weight distribution hitch

    By Black Smoke,
    • 5 replies
    • 2.8k views

  21. 2024 Sierra GMC Denali "super cruise"

    By Hobuck2000,
    • 3 replies
    • 3.3k views

  22. adjustable drop hitch

    By georgecdisc,
    • 10 replies
    • 35.8k views

  23. High Suspension

    By HighTowing,
    • 8 replies
    • 4.4k views

  24. Recalls and Special Service Bulletins

    By BCGM,
    • 2 replies
    • 5.6k views

  25. Curt gooseneck to 5th wheel conversion

    By gemarsh,
    • 9 replies
    • 1.7k views
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