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

    By newdude,   
    • 30 replies
    • 65.4k views

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

    By BCGM,
    • 21 replies
    • 1.6k views

  3. Towing In Loose Gravel 1 2

    By rdonarski,
    • 20 replies
    • 744 views

  4. 2024 SILVERADO 3500HD DURAMAX CLOGGED DPF AND WONT CONNECT TO TRAILERS 1 2 3

    By Clark Shirley,
    • 30 replies
    • 15.1k views

  5. Disengaged Tow Haul Mode

    By James Beyer,
    • 5 replies
    • 688 views

  6. 2023 2500hd 6.6 l8t gas lifter ticking with misfire 1 2

    By DuckBoi,
    • 15 replies
    • 16.2k views

  7. MAP Sensor Cleaning L5P

    By Crazy Canuck,
    • 8 replies
    • 1.1k views

  8. 2 speed transfer case optional now?

    By Hoginedgewood,
    • 8 replies
    • 700 views

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

    By FirstAscent,
    • 37 replies
    • 34k views

  10. 2020 3500 Diesel DPF Issue and Replacement

    By JW2020,
    • 6 replies
    • 16.7k views

  11. Remote Starting issue or not

    By BCGM,
    • 11 replies
    • 1.4k views

  12. 4 Wheel Drive System

    By GAMark,
    • 10 replies
    • 910 views

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

    By Jettech1,
    • 54 replies
    • 3.5k views

  14. 2024 Silverado 2500 HD with the 6.6 Gas (L8T) Engine 1 2 3 4 5

    By ChrisG-2019,
    • 71 replies
    • 93k views

  15. MPG Surprise

    By James Beyer,
    • 11 replies
    • 1.4k views

  16. 2026 Silverado 2500 Surround Vision Recording?

    By mkirkland,
    • 4 replies
    • 1.9k views

  17. 10 speed 6.6 gas torque converter

    By TeamSaris,
    • 3 replies
    • 764 views

  18. 2020 HD picture Thread 1 2 3 4 39

    By CRApex,   
    • 576 replies
    • 237.5k views

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

    By PBNB,
    • 6 replies
    • 1.5k views

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

    By ManyCamaroz,
    • 52 replies
    • 15.6k views

  21. Has anyone successfully ordered a 2026 3500HD?

    By Bob25thTA,
    • 7 replies
    • 1.2k views

  22. Exhaust brake & trailer brake lights

    By Jack Horn,
    • 4 replies
    • 478 views

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

    By gemarsh,
    • 211 replies
    • 64k views

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

    By Jettech1,
    • 16 replies
    • 1.6k views

  25. Stumped! Single clunk/pop when turning slow

    By 22 6.6gasser,
    • 6 replies
    • 885 views
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