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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

1,790 topics in this forum

  1. 2020+ T1 Chevrolet/GMC HD Quick Reference Guide 1 2 3

    By newdude,   
    • 30 replies
    • 65k views

  2. MAP Sensor Cleaning L5P

    By Crazy Canuck,
    • 8 replies
    • 954 views

  3. 2 speed transfer case optional now?

    By Hoginedgewood,
    • 8 replies
    • 497 views

  4. Travel Trailer 2024 2500 HD 6.6 Gas Engine ? 1 2

    By BCGM,
    • 15 replies
    • 1k views

  5. 2024 SILVERADO 3500HD DURAMAX CLOGGED DPF AND WONT CONNECT TO TRAILERS 1 2

    By Clark Shirley,
    • 28 replies
    • 14.5k views

  6. Do you keep your tires at full capacity? 80psi 1 2 3

    By FirstAscent,
    • 37 replies
    • 33.7k views

  7. 2020 3500 Diesel DPF Issue and Replacement

    By JW2020,
    • 6 replies
    • 16.6k views

  8. Disengaged Tow Haul Mode

    By James Beyer,
    • 4 replies
    • 462 views

  9. Remote Starting issue or not

    By BCGM,
    • 11 replies
    • 1.3k views

  10. 4 Wheel Drive System

    By GAMark,
    • 10 replies
    • 820 views

  11. Talk me out of it! 1 2 3 4

    By Jettech1,
    • 54 replies
    • 3.3k views

  12. 2024 Silverado 2500 HD with the 6.6 Gas (L8T) Engine 1 2 3 4 5

    By ChrisG-2019,
    • 71 replies
    • 92.5k views

  13. MPG Surprise

    By James Beyer,
    • 11 replies
    • 1.3k views

  14. 2026 Silverado 2500 Surround Vision Recording?

    By mkirkland,
    • 4 replies
    • 1.7k views

  15. 10 speed 6.6 gas torque converter

    By TeamSaris,
    • 3 replies
    • 709 views

  16. 2020 HD picture Thread 1 2 3 4 39

    By CRApex,   
    • 576 replies
    • 236.3k views

  17. Sudden Speaker Crackle/static - Bose Premium Sound - 2023 HD

    By PBNB,
    • 6 replies
    • 1.5k views

  18. Need tires soon, what are you replacing your originals with? 1 2 3 4

    By ManyCamaroz,
    • 52 replies
    • 15.3k views

  19. Has anyone successfully ordered a 2026 3500HD?

    By Bob25thTA,
    • 7 replies
    • 1.1k views

  20. Exhaust brake & trailer brake lights

    By Jack Horn,
    • 4 replies
    • 440 views

  21. CHECK YOUR DIFFS... 1 2 3 4 15

    By gemarsh,
    • 211 replies
    • 63.2k views

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

    By Jettech1,
    • 16 replies
    • 1.5k views

  23. Stumped! Single clunk/pop when turning slow

    By 22 6.6gasser,
    • 6 replies
    • 810 views

  24. Issue

    By TxShark,
    • 4 replies
    • 595 views

  25. WTH is with Ordering a New Truck- Here, Take My Money!

    By 426ted,
    • 7 replies
    • 862 views
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