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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.

    5.5k
    posts

1,787 topics in this forum

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

    By newdude,   
    • 30 replies
    • 64.1k views

  2. Remote Starting issue or not

    By BCGM,
    • 10 replies
    • 1.1k views

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

    By ChrisG-2019,
    • 71 replies
    • 91.2k views

  4. MPG Surprise

    By James Beyer,
    • 11 replies
    • 1.1k views

  5. 2026 Silverado 2500 Surround Vision Recording?

    By mkirkland,
    • 4 replies
    • 1.2k views

  6. 10 speed 6.6 gas torque converter

    By TeamSaris,
    • 3 replies
    • 537 views

  7. 4 Wheel Drive System

    By GAMark,
    • 9 replies
    • 533 views

  8. 2020 HD picture Thread 1 2 3 4 39

    By CRApex,   
    • 576 replies
    • 233.9k views

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

    By PBNB,
    • 6 replies
    • 1.4k views

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

    By ManyCamaroz,
    • 52 replies
    • 14.8k views

  11. Has anyone successfully ordered a 2026 3500HD?

    By Bob25thTA,
    • 7 replies
    • 976 views

  12. Exhaust brake & trailer brake lights

    By Jack Horn,
    • 4 replies
    • 344 views

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

    By gemarsh,
    • 211 replies
    • 61.8k views

  14. MAP Sensor Cleaning L5P

    By Crazy Canuck,
    • 5 replies
    • 616 views

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

    By Jettech1,
    • 16 replies
    • 1.3k views

  16. Stumped! Single clunk/pop when turning slow

    By 22 6.6gasser,
    • 6 replies
    • 704 views

  17. Issue

    By TxShark,
    • 4 replies
    • 527 views

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

    By 426ted,
    • 7 replies
    • 721 views

  19. 2023 2500hd 6.6 l8t gas lifter ticking with misfire

    By DuckBoi,
    • 14 replies
    • 15.2k views

  20. Zerk Fittings on 2500 HD

    By SpaceCoastTony,
    • 4 replies
    • 1.4k views

  21. Keep 6.6 gasser or move down to 3.0 Duramax? 1 2 3 4

    By BuckWallace,
    • 45 replies
    • 4.3k views

  22. 2500hd 6.6l gas enough 1 2

    By James Beyer,
    • 21 replies
    • 2k views

  23. iDash stats without the wires

    By mkirkland,
    • 1 reply
    • 313 views

  24. Fuse Size

    By AndrewF,
    • 1 reply
    • 449 views

  25. Anyone with a CUSTOM trim truck have a scrubbig sound from the interior of the driver's side passenger door?

    By No F-bdy Bs,
    • 9 replies
    • 853 views

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