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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. Trail Boss HD Wheel Specs

    By Bloody Marty,
    • 1 reply
    • 981 views

  2. Cruise control notification

    By Homer1959,
    • 0 replies
    • 346 views

  3. OEM tpms sensors 1 2

    By vucelick,
    • 17 replies
    • 2.2k views

  4. Why does it seem like Ram/Ford HD trucks are more common tow rigs? (RVs, dump trailers, etc)

    By UltimateToolReviews,
    • 10 replies
    • 1.3k views

  5. I got 285/65r20 BFGs...need to upsize spare tire?

    By Rod Strawderman,
    • 12 replies
    • 2.4k views

  6. iPod interface to '24 Denali HD

    By Kerry Pulaski,
    • 3 replies
    • 531 views

  7. i am looking for a new new to me truck and wanted to ask for opinions on the new 10 speeds transmissions that come on the 24 up trucks 1 2 3 4 6

    By 94yj,
    • 75 replies
    • 7.2k views

  8. Hill Start Assist Sensor Adjustment?

    By AndrewF,
    • 2 replies
    • 836 views

  9. Finally have my truck.... 1 2

    By Gary2500LTZ,
    • 17 replies
    • 1.8k views

  10. Trailer Profile Light or Heavy Trailer

    By Higginsc41,
    • 7 replies
    • 1.5k views

  11. Seats

    By James Beyer,
    • 6 replies
    • 1.7k views

  12. New Truck!

    By 2k19Sierra,
    • 4 replies
    • 1.1k views

  13. What is going on in Flint???

    By Gary2500LTZ,
    • 4 replies
    • 1.1k views

  14. Cabin air filter

    By rjgvt,
    • 10 replies
    • 13k views

  15. 2020 Gmc 2500HD Engine buzzing on acceleration

    By SKel,
    • 3 replies
    • 1k views

  16. .

    By 64BAwagon,
    • 12 replies
    • 1.3k views

  17. Ordered a 2025 and now waiting 1 2 3 4

    By xrichard,
    • 52 replies
    • 23k views

  18. 2024 GMC Sierra 3500 HD

    By john kari,
    • 4 replies
    • 1.3k views

  19. 2024 GMC HD Carplay glitching

    By Sam Avaiusini,
    • 2 replies
    • 1.4k views

  20. 2020 GMC AT4 Diesel Brakes lock up on their own. Extremely Dangerous!!! 1 2 3

    By joeidaho,
    • 42 replies
    • 31.1k views

  21. Passing on some info about second battery option. 1 2 3 4

    By 64BAwagon,
    • 48 replies
    • 26.2k views

  22. 22 2500hd gas

    By 22 6.6gasser,
    • 9 replies
    • 1.1k views

  23. 2022 tapping near oil pan after oil change

    By 22 6.6gasser,   
    • 0 replies
    • 928 views

  24. 2024 gmc 2500hd 6.6 gas intermittent p0458 Evap Control Valve "A" Circuit Low

    By Ausslo,
    • 5 replies
    • 3.4k views

  25. 2025 GMC 2500HD Duramax code U1962

    By DBaker,
    • 1 reply
    • 2.5k views

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