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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. Upfitter pic

    By rjgvt,
    • 4 replies
    • 1.5k views

  2. 3.73 vs 4.10 gear ratio which would get better fuel mileage?

    By 94yj,
    • 5 replies
    • 4.3k views

  3. am i allowed to post a car fax report on here? on a truck i want to buy from a dealer

    By 94yj,
    • 8 replies
    • 1k views

  4. ERROR | Brake Gain Not Recalled 1 2

    By Scott Hatten,
    • 24 replies
    • 25.6k views

  5. Rear Windows with privacy glass UV rating

    By Ringo2202,
    • 1 reply
    • 761 views

  6. Flexgate

    By dbdonavan,
    • 7 replies
    • 1.1k views

  7. 6.6 Gas MPG 1 2 3 4 9

    By brendon444,
    • 124 replies
    • 179.9k views

  8. 2020 to 2024 Sierra HD front end conversion!

    By Dbeto54,
    • 13 replies
    • 20.8k views

  9. 2500 HD EGR Door Molding

    By AndrewF,
    • 1 reply
    • 784 views

  10. ZR2 seats

    By Dunn,
    • 2 replies
    • 1.3k views

  11. Dually Tire Question(s)

    By jeffd,
    • 7 replies
    • 2.1k views
    • RGA
    • RGA

  12. 2024 GMC 3500 AT4 All Torque Specs

    By ptlumbard,
    • 6 replies
    • 2.6k views

  13. Towing capacity variences

    By bigblue2024,
    • 11 replies
    • 9.6k views

  14. Adaptive Cruise Control on 2024 Chevrolet 2500 4x4HD WT

    By Maxsboat,
    • 10 replies
    • 6.5k views

  15. Torsion Bar Suspension Stiffness

    By bruceb58,
    • 5 replies
    • 1.4k views

  16. Stolen Silverado

    By ManyCamaroz,
    • 12 replies
    • 13.5k views

  17. 2024 HD orders / status 1 2 3 4 49

    By Agargano98,
    • 720 replies
    • 125.8k views

  18. 2020 Silverado whistling noise

    By Mario C,
    • 3 replies
    • 994 views

  19. 275/50/22 on fancy rims (2024 Silverado 1500)

    By TDF89,
    • 7 replies
    • 4.2k views

  20. Flat Tow

    By Weedguy,
    • 13 replies
    • 35.2k views

  21. VIN Numbers

    By BCGM,
    • 6 replies
    • 12.8k views

  22. 2020 GMC 3500 w/ allison 10spd

    By daywright,
    • 2 replies
    • 811 views

  23. Universal Vehicle Module Option

    By rjgvt,
    • 1 reply
    • 5.5k views

  24. Steering Wheel Favorites buttons working intermittently

    By sigmonster,
    • 3 replies
    • 6k views

  25. Owners manual 1 2

    By earn3dale,
    • 17 replies
    • 10.7k views
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