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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. Locking Gas Door? 1 2

    By BigEdB,   
    • 21 replies
    • 61.8k views

  2. power folding mirrors 1 2

    By Dunn,
    • 16 replies
    • 60.5k views

  3. Wireless Apple Carplay quits working 1 2 3 4 5

    By sigmonster,
    • 64 replies
    • 59.2k views

  4. I have the dealer supplied Auxiliary switch upfitter package - how to get through the firewall on a 2024 3500 HD gas engine truck? 1 2 3 4

    By Doug Krussel,
    • 49 replies
    • 58.6k views

  5. Nothing but PROBLEMS with the 2024 GMC Denali Ultimate 2500 1 2

    By ShibaPauly,   
    • 23 replies
    • 57.8k views

  6. GMC marker lights 1 2 3

    By Bboozer,
    • 34 replies
    • 57.8k views

  7. First 500 miles duramax break-in opinions? 1 2 3 4

    By FirstAscent,
    • 47 replies
    • 57.2k views

  8. Autotrac transfer case vs regular 1 2

    By nick112288,
    • 24 replies
    • 54.4k views

  9. Will a new 2500 HD fit through a 7 ft tall std garage door? 1 2 3

    By jd64,
    • 36 replies
    • 54.3k views

  10. Heavy Duty front spring package??? 1 2

    By Norman Neufeld,
    • 26 replies
    • 53.9k views

  11. 2022 GMC Sierra 1500 and others BCM footwell lighting pinout - Denali Doorsill Install Info 1 2 3 4 6

    By matt99199,
    • 84 replies
    • 53k views

  12. Extended Idle Time 1 2

    By Nspctr,
    • 28 replies
    • 51.7k views

  13. Kryptonite stage 3 leveling kit. 1 2

    By Londart2020,
    • 24 replies
    • 51.2k views

  14. does center console open or no ? 1 2

    By xidex,
    • 18 replies
    • 51.2k views

  15. Difference btwn 2500HD and 3500HD SRW 1 2 3 4

    By Moyses,
    • 53 replies
    • 50.5k views

  16. Tire Pressure 1 2

    By Michael621,
    • 18 replies
    • 49.6k views

  17. Differential gear oil

    By Jay2500,
    • 7 replies
    • 49.4k views

  18. Gas vs Diesel Cost of Ownership 1 2 3 4

    By CaptainMorganNC,
    • 59 replies
    • 48.6k views

  19. Multi Pro Tailgate Removal 1 2

    By hkyfsh,
    • 25 replies
    • 48.2k views

  20. 2020 HD MultiPro Tailgate Hitch Ball Solution 1 2 3 4

    By MrGraff,
    • 50 replies
    • 47.7k views

  21. Oil 1 2 3 4

    By 07Serria,
    • 58 replies
    • 47.6k views

  22. Can the BACKS of rear seats be unlocked & released?

    By Say When,
    • 8 replies
    • 47k views

  23. 18 inch wheels vs 20 inch wheels 1 2

    By artie2908,
    • 22 replies
    • 46.6k views

  24. Trailer rear camera - 5th Wheels 1 2 3 4

    By es2020HD,   
    • 50 replies
    • 46.6k views

  25. 2022 GMC Sierra 3500HD fuse box

    By Sachinb,
    • 14 replies
    • 45.7k views
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