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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. AT4 base model???? Options? Still a NICE truck?

    By Gabe Bunn,
    • 2 replies
    • 1.6k views

  2. Question for HD owners in King/Pierce counties - Western Washington State

    By 21GMC,
    • 8 replies
    • 1.6k views

  3. ZR2 2500

    By AngelPhoenix,
    • 6 replies
    • 1.6k views

  4. First GM truck in 25 years!

    By Pryme,
    • 7 replies
    • 1.6k views

  5. Curt gooseneck to 5th wheel conversion

    By gemarsh,
    • 9 replies
    • 1.6k views

  6. 2020 3500 hd ior radio

    By RickDee,
    • 11 replies
    • 1.6k views

  7. What's the Vertical Bar in the Photo?

    By unit,
    • 3 replies
    • 1.6k views

  8. 2020 Sierra HD Denali Ultimate Trade in Value

    By PaulGA,
    • 3 replies
    • 1.6k views
    • Z45
    • Z45

  9. water spots

    By Rule#5,
    • 2 replies
    • 1.6k views

  10. 2020 Silverado 2500 HD

    By Qud4012,
    • 5 replies
    • 1.6k views

  11. Trailer Brake Controller or P3

    By mandrewbot3k,
    • 11 replies
    • 1.6k views

  12. Factory Bose sub replacement

    By Leonc99,
    • 0 replies
    • 1.6k views

  13. Compatible lift kits for ‘21 2500?

    By YourSpecialist,
    • 3 replies
    • 1.6k views

  14. Just wondeing about delay

    By Sunshine39,
    • 2 replies
    • 1.6k views

  15. Anyone hear when Heated

    By James Beyer,
    • 5 replies
    • 1.6k views

  16. Heated Steering Wheel Retrofit -- How to get initial Leather wrapped vs Plastic retrofit junk for the recall

    By Blue20Sailor,
    • 1 reply
    • 1.6k views

  17. In the Red

    By Texas1836,
    • 6 replies
    • 1.6k views

  18. Ally extended warranty

    By Truckchauffeur,
    • 2 replies
    • 1.5k views

  19. Upfitter pic

    By rjgvt,
    • 4 replies
    • 1.5k views

  20. 2020 2500 Hard Reset

    By Ameziere22,
    • 1 reply
    • 1.5k views

  21. Leveling a 2020 Sierra 1500 Elevation

    By Roxbury5,
    • 5 replies
    • 1.5k views

  22. 1st big tow

    By littleal,
    • 6 replies
    • 1.5k views

  23. are the HD dbl cabs bigger than 1500 dbl cabs?

    By Dunn,
    • 5 replies
    • 1.5k views

  24. Bumper hitch advice

    By pioneer 1,
    • 4 replies
    • 1.5k views

  25. 2023 GMC Serria Denali Vanity Lights

    By jrryc,
    • 2 replies
    • 1.5k views
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