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

    By newdude,   
    • 30 replies
    • 64.4k views

  2. 2020 3500 Diesel DPF Issue and Replacement

    By JW2020,
    • 6 replies
    • 16.4k views

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

    By Clark Shirley,
    • 27 replies
    • 14.1k views

  4. Travel Trailer 2024 2500 HD 6.6 Gas Engine ?

    By BCGM,
    • 12 replies
    • 463 views

  5. Disengaged Tow Haul Mode

    By James Beyer,
    • 4 replies
    • 296 views

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

    By FirstAscent,
    • 36 replies
    • 33.1k views

  7. Remote Starting issue or not

    By BCGM,
    • 11 replies
    • 1.2k views

  8. 4 Wheel Drive System

    By GAMark,
    • 10 replies
    • 678 views

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

    By Jettech1,
    • 54 replies
    • 3.1k views

  10. MAP Sensor Cleaning L5P

    By Crazy Canuck,
    • 6 replies
    • 733 views

  11. 2024 Silverado 2500 HD with the 6.6 Gas (L8T) Engine 1 2 3 4 5

    By ChrisG-2019,
    • 71 replies
    • 91.8k views

  12. MPG Surprise

    By James Beyer,
    • 11 replies
    • 1.2k views

  13. 2026 Silverado 2500 Surround Vision Recording?

    By mkirkland,
    • 4 replies
    • 1.4k views

  14. 10 speed 6.6 gas torque converter

    By TeamSaris,
    • 3 replies
    • 604 views

  15. 2020 HD picture Thread 1 2 3 4 39

    By CRApex,   
    • 576 replies
    • 235k views

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

    By PBNB,
    • 6 replies
    • 1.4k views

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

    By ManyCamaroz,
    • 52 replies
    • 15.1k views

  18. Has anyone successfully ordered a 2026 3500HD?

    By Bob25thTA,
    • 7 replies
    • 1k views

  19. Exhaust brake & trailer brake lights

    By Jack Horn,
    • 4 replies
    • 378 views

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

    By gemarsh,
    • 211 replies
    • 62.3k views

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

    By Jettech1,
    • 16 replies
    • 1.3k views

  22. Stumped! Single clunk/pop when turning slow

    By 22 6.6gasser,
    • 6 replies
    • 737 views

  23. Issue

    By TxShark,
    • 4 replies
    • 557 views

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

    By 426ted,
    • 7 replies
    • 766 views

  25. 2023 2500hd 6.6 l8t gas lifter ticking with misfire

    By DuckBoi,
    • 14 replies
    • 15.3k views
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