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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. 6.6l Gasser

    By Robby23,
    • 9 replies
    • 3.9k views

  2. It’s OK to tell me I’m over reacting. 1 2 3

    By GMCDuraMan,
    • 41 replies
    • 3.9k views

  3. Anyone unhappy with WT trim? 1 2

    By nick112288,
    • 23 replies
    • 3.9k views

  4. Good deal in AT4

    By CaptainMorganNC,
    • 6 replies
    • 3.9k views

  5. Great Day Center-Lok Overhead Gun Rack for Trucks

    By Say When,
    • 4 replies
    • 3.9k views

  6. New Duramax rumor?

    By XY74,
    • 13 replies
    • 3.9k views

  7. 12V power to truck bed

    By AndrewF,
    • 11 replies
    • 3.9k views

  8. Max spare tire size???

    By sballmann45,
    • 2 replies
    • 3.9k views

  9. New to GM diesel 1 2

    By Mike Weinandy,
    • 18 replies
    • 3.9k views

  10. Duramax don't F around 1 2

    By dieselfan1,
    • 17 replies
    • 3.9k views

  11. Feb Incentives 1 2

    By agcntry,
    • 16 replies
    • 3.9k views

  12. Beat with the ugly stick?

    By DTB,
    • 10 replies
    • 3.9k views

  13. 2500 vs 3500 need quick answer! 1 2

    By crazydog,
    • 18 replies
    • 3.9k views

  14. l5p exhaust tips

    By BB&Chiveon,
    • 4 replies
    • 3.8k views

  15. 2020 Duramax part “back order “ dilemma

    By burnerET,
    • 9 replies
    • 3.8k views

  16. Unused shifter square on 2024 GMC 2500HD

    By rjgvt,
    • 3 replies
    • 3.8k views

  17. Clunk noises in cabin

    By Pate Services,
    • 5 replies
    • 3.8k views

  18. 2020 Sierra HD AT4

    By mookdoc6,
    • 11 replies
    • 3.8k views

  19. Trade In Value 1 2

    By NCCaptainMorgan,
    • 16 replies
    • 3.8k views

  20. Any way to add audio controls to steering wheel on 2020 Custom?

    By Weatherby460,
    • 6 replies
    • 3.8k views

  21. My TPW is next week

    By migrabill,   
    • 12 replies
    • 3.7k views

  22. 2020 GMC Denali HD possible brake control module issue

    By Battery Frank,
    • 10 replies
    • 3.7k views

  23. And we're back after a 3 week vacation towing our camper 3300 miles with our 22 gasser to Maine from Alabama! 1 2 3

    By Jettech1,
    • 41 replies
    • 3.7k views

  24. Did the HD brake controller recall fix your brakes?

    By nitro882,
    • 7 replies
    • 3.7k views

  25. Switching brands 1 2

    By pioneer 1,
    • 23 replies
    • 3.7k views
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