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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
    • 64k views

  2. 2026 Silverado 2500 Surround Vision Recording?

    By mkirkland,
    • 4 replies
    • 1.1k views

  3. 10 speed 6.6 gas torque converter

    By TeamSaris,
    • 3 replies
    • 510 views

  4. 4 Wheel Drive System

    By GAMark,
    • 9 replies
    • 484 views

  5. MPG Surprise

    By James Beyer,
    • 9 replies
    • 992 views

  6. 2020 HD picture Thread 1 2 3 4 39

    By CRApex,   
    • 576 replies
    • 233.4k views

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

    By PBNB,
    • 6 replies
    • 1.3k views

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

    By ManyCamaroz,
    • 52 replies
    • 14.7k views

  9. Has anyone successfully ordered a 2026 3500HD?

    By Bob25thTA,
    • 7 replies
    • 950 views

  10. Exhaust brake & trailer brake lights

    By Jack Horn,
    • 4 replies
    • 328 views

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

    By gemarsh,
    • 211 replies
    • 61.6k views

  12. MAP Sensor Cleaning L5P

    By Crazy Canuck,
    • 5 replies
    • 595 views

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

    By Jettech1,
    • 16 replies
    • 1.3k views

  14. Stumped! Single clunk/pop when turning slow

    By 22 6.6gasser,
    • 6 replies
    • 692 views

  15. Issue

    By TxShark,
    • 4 replies
    • 518 views

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

    By 426ted,
    • 7 replies
    • 709 views

  17. 2023 2500hd 6.6 l8t gas lifter ticking with misfire

    By DuckBoi,
    • 14 replies
    • 15.1k views

  18. Zerk Fittings on 2500 HD

    By SpaceCoastTony,
    • 4 replies
    • 1.4k views

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

    By BuckWallace,
    • 45 replies
    • 4.2k views

  20. 2500hd 6.6l gas enough 1 2

    By James Beyer,
    • 21 replies
    • 2k views

  21. iDash stats without the wires

    By mkirkland,
    • 1 reply
    • 305 views

  22. Fuse Size

    By AndrewF,
    • 1 reply
    • 434 views

  23. 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
    • 840 views

  24. Ignition Key wont come out at times. 1 2 3

    By 513Brewer,
    • 32 replies
    • 80.6k views

  25. Why does anyone still make a 3/4 ton when you can get a 1 ton SRW with a gas motor? 1 2 3

    By UltimateToolReviews,
    • 34 replies
    • 3.9k views

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