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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. cab height

    By Gary Wiles,
    • 14 replies
    • 15.2k views

  2. Unused timed auxiliary fuse

    By Metal.Dave,
    • 5 replies
    • 446 views

  3. Roof clearance lights and fender strobe mod

    By Metal.Dave,
    • 2 replies
    • 649 views

  4. Got really lucky Saturday night not hitting bambie.

    By Jettech1,
    • 11 replies
    • 700 views

  5. Front Differential Noise

    By RCTaylor,
    • 12 replies
    • 1.8k views

  6. 2024 sierra 2500 seats

    By Branch29,
    • 12 replies
    • 5.4k views

  7. Help finding High beam signal wire

    By Metal.Dave,
    • 12 replies
    • 1.6k views

  8. Rear Window Leak on 2020 3500HD Denali 1 2 3

    By Pate Services,
    • 37 replies
    • 11.5k views

  9. Help with torsionbars 1 2

    By doidera00,
    • 27 replies
    • 27.9k views

  10. Trade High Country for ZR2? 1 2

    By gregus73,
    • 29 replies
    • 1.7k views

  11. Is there a difference between the frames for a 2500 and 3500? 1 2 3

    By Jettech1,
    • 43 replies
    • 41.9k views

  12. Dash/Infotainment Screen/Climate Button Backlights Randomly Turn Off . . . then On

    By jake111,
    • 8 replies
    • 1.1k views

  13. has anyone ever added fender flare lights on a silverado 2500

    By jramo2876,
    • 0 replies
    • 292 views

  14. Rear height off by an inch - left to right 1 2 3

    By AbzDad,
    • 43 replies
    • 3.5k views

  15. Program for DIY diagnostic and maintenance 1 2

    By jeetS,
    • 15 replies
    • 1.4k views

  16. 2" Hitch 2.5" Receiver Anti Rattle 1 2 3 4

    By AndrewF,
    • 48 replies
    • 4.2k views

  17. Not again...What the heck GM? UPDATED AGAIN Dec.12 1 2

    By 426ted,
    • 20 replies
    • 2.5k views

  18. Who has heard of a truck bed heater?

    By Jettech1,
    • 14 replies
    • 1.2k views

  19. Oil analysis

    By XY74,
    • 5 replies
    • 536 views

  20. Dented my tailgate. Decided to pound it out myself. 1 2

    By Pryme,
    • 19 replies
    • 1.6k views

  21. Gas mileage when towing 8k lbs.

    By Jettech1,
    • 13 replies
    • 1.3k views

  22. Can the 6.6 gas HD hit 20mpg hwy? Got close. 1 2 3

    By Pryme,
    • 31 replies
    • 5.3k views

  23. Weird Idle

    By Jettech1,
    • 11 replies
    • 877 views

  24. 2500 HD Custom Rear Wheel Liners 1 2

    By BCGM,
    • 21 replies
    • 3.9k views

  25. How to keep cameras on while driving

    By Cracksrubi,
    • 8 replies
    • 3k views
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