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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

1,789 topics in this forum

  1. New 2021 2500HD Diesel and DEF

    By fly53usmc,
    • 11 replies
    • 12.9k views

  2. 2020 GMC Denali 3500 Winter Front

    By mmey4,   
    • 3 replies
    • 15.7k views

  3. 2021 chevy rst

    By M81PAL,
    • 1 reply
    • 794 views

  4. Grille part number needed

    By Wintersux,
    • 7 replies
    • 1.7k views

  5. When do service manuals appear

    By mrjulian416,
    • 1 reply
    • 1k views

  6. What’s it worth?

    By RonaldA,
    • 4 replies
    • 1.3k views

  7. Bakflip MX4 issue 1 2 3 4

    By GearHead71,
    • 47 replies
    • 21k views

  8. 2021 6.6L Duramax Diesel Cold Start ......

    By Tucson Jack,
    • 2 replies
    • 6.8k views

  9. should i change?

    By crazydog,
    • 10 replies
    • 1.5k views

  10. "Moaning" Brakes When Dusty

    By Shawn T,
    • 3 replies
    • 7.1k views

  11. why are the 3500hd reg cab work trucks impossible to find

    By 94yj,
    • 3 replies
    • 1.5k views

  12. Rearview Mirror Camera aiming

    By Keith_Schumaker,
    • 10 replies
    • 7.9k views

  13. Curb Weight of 2021 Black Diamond

    By Austinamp,
    • 2 replies
    • 1.5k views

  14. 2021 Chevy 2500 Texas Edition vs All Star Edition???????? 1 2

    By Gabe Bunn,
    • 15 replies
    • 12.4k views

  15. 5th Wheel Package Wiring Question

    By mrjulian416,
    • 5 replies
    • 1.8k views

  16. 2020 2500 max towing 1 2

    By ultrascott,
    • 25 replies
    • 8.7k views

  17. Can’t lock employee price on HDs

    By Hockeylover86,
    • 9 replies
    • 2.3k views

  18. Employee vs Supplier Pricing

    By Jimmy-Mack,
    • 3 replies
    • 1.9k views

  19. Oil in coolant

    By Roy and Tracy Boling,
    • 5 replies
    • 11.4k views

  20. Buying 2021 2500 AT4 Diesel in Canada

    By HydrogenCyanide,
    • 2 replies
    • 944 views

  21. Can you turn off auto braking or safety seat etc?

    By jeetS,
    • 10 replies
    • 8.8k views

  22. Real world 35x12.50 R20 answers

    By Londart2020,
    • 4 replies
    • 22.9k views

  23. 35/11.50R20

    By Londart2020,
    • 4 replies
    • 17.9k views

  24. GM Extended Warranty and/or Vehicle Service Contracts

    By Greg Kruse,
    • 6 replies
    • 6.2k views

  25. Overhead Console Unused Wire Plug

    By Gr8DaneOperator,   
    • 1 reply
    • 2.8k views
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