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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. The new truck is here

    By littleal,
    • 8 replies
    • 1.8k views

  2. Is this the air filter for the 6.6 gas?

    By Pryme,
    • 3 replies
    • 2.5k views

  3. 2020 6.6L Gasser dyno pull 1 2

    By BoilerUP,
    • 22 replies
    • 42.5k views

  4. 2023 Silverado 2500HD Custom - Steering Wheel Upgrade 1 2

    By lmullenaux,
    • 16 replies
    • 20.8k views

  5. 2020 Silverado 2500 "Idle vehicle to cool engine" message

    By Liz Mosbey,
    • 10 replies
    • 19.8k views

  6. 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

  7. Test drove a 2024 AT4X gasser

    By 453030,
    • 13 replies
    • 6.7k views

  8. New to GM diesel 1 2

    By Mike Weinandy,
    • 18 replies
    • 3.9k views

  9. Who doesn't love a Denali??? But those wheels?? 1 2 3

    By Jettech1,
    • 30 replies
    • 5.3k views

  10. Need a comparison on Airbags - Firestone, Airlift and ReadyLift AirIQ

    By chopjaw,
    • 1 reply
    • 4.9k views

  11. Air chuck/ tire gauge

    By Mike Weinandy,
    • 9 replies
    • 1.6k views

  12. Questions: Plowing with an AT4 - Dual alternator, auxiliary battery, hood scoop

    By thewholetruth,
    • 4 replies
    • 2.6k views

  13. 2024 GMC DENALI ULTIMATE HALF TON PICK UP

    By Hobuck2000,
    • 5 replies
    • 2.3k views

  14. Looking for a mid rise truck cap for 2024 Chevy/ GMC short bed with multi flex tailgate.

    By Agahoe,
    • 8 replies
    • 7.6k views

  15. Tire pressures 1 2

    By rjgvt,
    • 18 replies
    • 27.2k views

  16. Downpour Metallic not available on specific Trims

    By Red Hawk,
    • 1 reply
    • 2.2k views

  17. Leveling a 2020 Sierra 1500 Elevation

    By Roxbury5,
    • 5 replies
    • 1.5k views

  18. GM HD DISCOUNTS

    By littleal,
    • 6 replies
    • 3.1k views

  19. Squeaky FOX 2.5 Shocks

    By sballmann45,
    • 1 reply
    • 1.2k views

  20. Backspacing on ZR2 wheels

    By chevy2tuff2006,
    • 3 replies
    • 4.5k views

  21. If I wasn't so close to retirement.....I would buy this truck tomorrow! 1 2 3 4 5

    By Jettech1,
    • 70 replies
    • 6.6k views

  22. chevy vs gmc

    By TeamSaris,
    • 11 replies
    • 8.2k views

  23. Truck Bed Mat

    By ManyCamaroz,
    • 7 replies
    • 4.4k views

  24. 2020 Siverado HD - BCM Wiring - Connector X5 Pigtail Extension

    By JTRACKER,
    • 1 reply
    • 3k views

  25. Portable Air Compressor 1 2

    By marpel,
    • 15 replies
    • 9.6k views
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