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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. Active Aero Shutters

    By ShotgunZ71,
    • 1 reply
    • 1.4k views

  2. Picked up '20 Denali 2500HD-Review 1 2 3 4

    By Shawn T,
    • 56 replies
    • 11k views

  3. Plastic Caps Inside Rear Corners Of Bed On 2500HD Custom?

    By 24v,
    • 2 replies
    • 3k views
    • 24v
    • 24v

  4. SLT vs SLE Options

    By GPR,
    • 11 replies
    • 6.5k views

  5. 2020 HD Badging

    By Mr. Puzzled,
    • 10 replies
    • 4.3k views

  6. DRWs on the way

    By KCJackson1,
    • 2 replies
    • 811 views

  7. 6.6 Gas tow 8k lbs up to 10k feet. Rocky Mtn High 1 2

    By 2018GMC,
    • 18 replies
    • 7.4k views

  8. Finally! 1 2

    By Rufus28,
    • 21 replies
    • 2.7k views

  9. Large safety recall just issued by GM

    By SilveradoX2,
    • 3 replies
    • 968 views

  10. Bed view camera/trailer camera wiring

    By wowens79,
    • 0 replies
    • 539 views

  11. Strike 1 2 3

    By JW2020,
    • 35 replies
    • 5.6k views

  12. 2020 Bose premium sound system

    By Hicks9528,
    • 0 replies
    • 3k views

  13. 2019 gmc HD 2500 wheels will fit 2020 HD 2500?

    By Peekaboo Bruizer,
    • 7 replies
    • 10.4k views

  14. onboard battery conditioner

    By robinbit,
    • 1 reply
    • 811 views

  15. Tire Fill Alert

    By robinbit,
    • 0 replies
    • 1.9k views

  16. Jump Seat Removal - Need storage 2020 Custom 2500

    By Ryan Berry,
    • 0 replies
    • 5.3k views

  17. Door flexing

    By greatmizzou,
    • 3 replies
    • 879 views

  18. Tow Mirrors

    By Capt Call,
    • 6 replies
    • 1.5k views

  19. Auto heat / cool seats based on air temp

    By AT4 HD Ron,
    • 6 replies
    • 5.2k views

  20. Curb weight 1 2

    By mbsfgts,
    • 28 replies
    • 19k views

  21. Does the new Allison have “Auto” 4wd?

    By EXSlider400,
    • 7 replies
    • 9.3k views

  22. Mirror and bed lights on with reverse mod???

    By skav,
    • 5 replies
    • 11.3k views

  23. Project farm diesel additive test

    By Irish80,
    • 4 replies
    • 9.6k views

  24. 2020 3500 DRW

    By jjackkrash,
    • 3 replies
    • 857 views

  25. Costco Deal

    By wowens79,
    • 8 replies
    • 2k views
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