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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.

    8.8k
    posts

  2. Modifications & Accessories

    Bumper replacements, 5th wheel hitches, auxiliary lighting, and suspension upgrades for your workhorse.

    11k
    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

1,791 topics in this forum

  1. Questions on using a Sierra/Silverado to haul a slide in camper 1 2

    By RKCRLR,
    • 26 replies
    • 7.8k views

  2. 2021 Silverado 2500 LT Front License Plate Bracket Removal??

    By ArkChevy,
    • 13 replies
    • 41.1k views

  3. 2025 HD production in Flint

    By 64BAwagon,
    • 9 replies
    • 1.7k views

  4. 2500 HD ZR2 and AT4X owners, which way is your spare tire facing?

    By Red Hawk,
    • 5 replies
    • 3.9k views

  5. L8T 6.6 Gas Oil Consumption At 30K 21' 2500HD

    By Antny,
    • 1 reply
    • 3.7k views

  6. opinions on this car fax report please

    By 94yj,
    • 9 replies
    • 1.2k views

  7. Did the HD brake controller recall fix your brakes?

    By nitro882,
    • 7 replies
    • 3.9k views

  8. Upfitter pic

    By rjgvt,
    • 4 replies
    • 1.6k views

  9. 3.73 vs 4.10 gear ratio which would get better fuel mileage?

    By 94yj,
    • 5 replies
    • 4.6k views

  10. 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

  11. ERROR | Brake Gain Not Recalled 1 2

    By Scott Hatten,
    • 24 replies
    • 25.9k views

  12. Rear Windows with privacy glass UV rating

    By Ringo2202,
    • 1 reply
    • 785 views

  13. Flexgate

    By dbdonavan,
    • 7 replies
    • 1.2k views

  14. 6.6 Gas MPG 1 2 3 4 9

    By brendon444,
    • 124 replies
    • 181.7k views

  15. 2020 to 2024 Sierra HD front end conversion!

    By Dbeto54,
    • 13 replies
    • 21.6k views

  16. 2500 HD EGR Door Molding

    By AndrewF,
    • 1 reply
    • 818 views

  17. ZR2 seats

    By Dunn,
    • 2 replies
    • 1.3k views

  18. Dually Tire Question(s)

    By jeffd,
    • 7 replies
    • 2.2k views
    • RGA
    • RGA

  19. 2024 GMC 3500 AT4 All Torque Specs

    By ptlumbard,
    • 6 replies
    • 2.8k views

  20. Towing capacity variences

    By bigblue2024,
    • 11 replies
    • 10.2k views

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

    By Maxsboat,
    • 10 replies
    • 6.8k views

  22. Torsion Bar Suspension Stiffness

    By bruceb58,
    • 5 replies
    • 1.4k views

  23. Stolen Silverado

    By ManyCamaroz,
    • 12 replies
    • 13.6k views

  24. 2024 HD orders / status 1 2 3 4 49

    By Agargano98,
    • 720 replies
    • 127.9k views

  25. 2020 Silverado whistling noise

    By Mario C,
    • 3 replies
    • 1k views

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