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

    By 2018GMC,
    • 18 replies
    • 7.2k views

  2. First Time Towing With New 2500HD 1 2

    By unit,
    • 18 replies
    • 3.3k views

  3. GM FRIENDS AND FAMILY 1 2

    By SKEETER1978,
    • 18 replies
    • 4.1k views

  4. Good Deal? 1 2

    By bigman32hockey,
    • 18 replies
    • 2k views

  5. What bumper hitch setups are you using? 1 2

    By greatmizzou,
    • 18 replies
    • 8.8k views

  6. Has anyone seen a 2020 GMC Sierra HD ? 1 2

    By massbowtie,
    • 18 replies
    • 3.4k views

  7. 2020 2500HD vs 3500HD ride quality? 1 2

    By MrChips,
    • 18 replies
    • 24.9k views

  8. 2026 HD paint colors 1 2

    By 64BAwagon,
    • 18 replies
    • 13.1k views

  9. Observation using cruise while towing 1 2

    By Sonders,
    • 18 replies
    • 4.7k views

  10. Tire Pressure 1 2

    By Michael621,
    • 18 replies
    • 49.6k views

  11. 2500/3500 GMC HD Diesel - Real World Towing? 1 2

    By Supercup,
    • 18 replies
    • 12.2k views

  12. Improving turning radius 1 2

    By Arkangel,
    • 18 replies
    • 45.2k views

  13. 2021 2500 HD PRICING 1 2

    By spm1us,
    • 18 replies
    • 3.9k views

  14. Stop Order on 2023 HD's? 1 2

    By dal1980,
    • 18 replies
    • 4.5k views

  15. '21 3500 Denali Pricing...help! 1 2

    By xETERNALx,
    • 18 replies
    • 4k views

  16. Winter driving 1 2

    By gregus73,
    • 18 replies
    • 8.2k views

  17. Anybody ever run into this 1 2

    By crp_diem,
    • 18 replies
    • 2.6k views

  18. Later Retrofit 1 2

    By Cheekster96,
    • 18 replies
    • 4.6k views

  19. Power Folding Mirrors 1 2

    By bigman32hockey,
    • 18 replies
    • 20.1k views

  20. 2500 vs 3500 need quick answer! 1 2

    By crazydog,
    • 18 replies
    • 3.8k views

  21. Tire pressures 1 2

    By rjgvt,
    • 18 replies
    • 27.2k views

  22. Park Assist Retrofit 1 2

    By kylant,
    • 18 replies
    • 17.6k views

  23. 4300 status 1 2

    By Cheekster96,
    • 18 replies
    • 6.7k views

  24. New to GM diesel 1 2

    By Mike Weinandy,
    • 18 replies
    • 3.9k views

  25. Invisible Trailer Program: what am I missing? 1 2

    By Shawn T,
    • 18 replies
    • 10.6k views

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