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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

1,787 topics in this forum

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

    By newdude,   
    • 30 replies
    • 64.1k views

  2. 2020 HD picture Thread 1 2 3 4 39

    By CRApex,   
    • 576 replies
    • 234k views

  3. 6.6 Gas MPG 1 2 3 4 9

    By brendon444,
    • 124 replies
    • 180k views

  4. Upfitter switches 1 2 3 4 10

    By Truckchauffeur,
    • 146 replies
    • 167.9k views

  5. Auxiliary Accessory Trailer Camera 1 2 3 4 12

    By Scott Perkins,
    • 169 replies
    • 143.8k views

  6. 2024 HD orders / status 1 2 3 4 49

    By Agargano98,
    • 720 replies
    • 125.8k views

  7. What Triggers "Check Trailer Wiring" DIC Message 1 2 3

    By Wxman,
    • 39 replies
    • 123.1k views

  8. Drivability of 6.6L gas 2500 vs 6.2L 1500 1 2 3 4 6

    By RE1,
    • 83 replies
    • 121.2k views

  9. Inventory and ordering lead times 1 2 3 4 32

    By Rozz522,
    • 470 replies
    • 106.6k views

  10. What does “Off-road mode do?”

    By Limelight,
    • 3 replies
    • 96.5k views

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

    By ChrisG-2019,
    • 71 replies
    • 91.3k views

  12. Biggest tire size on stock 18' Rim? 1 2

    By Sniperdan,
    • 16 replies
    • 90.9k views

  13. Fuel mileage on 6.6 duramax & 6.6 gas! 1 2

    By Fastrac,
    • 17 replies
    • 86k views

  14. 2020 TPMS/trailer cameras 1 2 3 4 18

    By sdelam,
    • 258 replies
    • 85.4k views

  15. 295/65R20 1 2 3

    By bharris515,
    • 30 replies
    • 82.4k views

  16. Factory 5th wheel prep 1 2 3 4 10

    By powerhaulic,
    • 143 replies
    • 81.1k views

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

    By 513Brewer,
    • 32 replies
    • 80.9k views

  18. The Inevitable Comparison: GM 6.6 vs. Ford 7.3 1 2 3 4 9

    By C/K Man,
    • 120 replies
    • 77.6k views

  19. Power outlet 1 2

    By Los-0,
    • 26 replies
    • 77.2k views

  20. 6 speed or 10 speed Allison. Which do you prefer? 1 2

    By Gray,
    • 24 replies
    • 74.5k views

  21. No 12v Power Outlets 1 2 3

    By UWSkier,
    • 32 replies
    • 72.3k views

  22. 2500 HD - 10,650 lbs. GVWR? 1 2 3 4 5

    By tom18287,
    • 74 replies
    • 72.1k views

  23. Check Engine Air Filter System Message

    By Rob57,   
    • 10 replies
    • 69.8k views

  24. 6.6 gas 1 2 3 4 9

    By gearheadesw,
    • 132 replies
    • 66.4k views

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

    By gemarsh,
    • 211 replies
    • 61.9k views

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