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

    By AbzDad,
    • 43 replies
    • 2.9k views

  2. Help deciding which hitch mount. What do you guys run? 1 2 3

    By Pryme,
    • 43 replies
    • 5.9k views

  3. Goodyear Trailrunner Tires Sidewall Issue 1 2 3

    By twofish,
    • 42 replies
    • 23.1k views

  4. 2020 GMC AT4 Diesel Brakes lock up on their own. Extremely Dangerous!!! 1 2 3

    By joeidaho,
    • 42 replies
    • 30.9k views

  5. Who has "upgraded" from a 1500 gas to a 2500 Duramax? 1 2 3

    By FirstAscent,
    • 42 replies
    • 11.5k views

  6. Let’s discuss Rust! 1 2 3

    By Pryme,
    • 41 replies
    • 20.5k views

  7. Is a Snowplow Package a Stiffer Ride? 2024 GMC Sierra HD2500 Denali Ultimate 1 2 3

    By Ray@Paula,
    • 41 replies
    • 19.2k views

  8. It’s OK to tell me I’m over reacting. 1 2 3

    By GMCDuraMan,
    • 41 replies
    • 3.9k views

  9. And we're back after a 3 week vacation towing our camper 3300 miles with our 22 gasser to Maine from Alabama! 1 2 3

    By Jettech1,
    • 41 replies
    • 3.7k views

  10. Would you buy the gasser or diesel? 1 2 3

    By Londart2020,
    • 40 replies
    • 11k views

  11. Discounts on 2020 GMC Sierra 2500/3500HD trucks & extended warranty? 1 2 3

    By Say When,
    • 40 replies
    • 7.8k views

  12. 2023 Allison transmission valve assembly 1 2 3

    By Lars Ohrstrom,
    • 40 replies
    • 26.1k views

  13. AT4 HD 1 2 3

    By gearheadesw,
    • 40 replies
    • 14.5k views

  14. AT4 vs Denali 1 2 3

    By brclark82,
    • 39 replies
    • 38.7k views

  15. 2020 2500HD console to jump seat swap 1 2 3

    By Craig Deary,   
    • 39 replies
    • 45.4k views

  16. Transparent Trailer 1 2 3

    By cNate,
    • 39 replies
    • 25.9k views

  17. I want to brag a bit concerning the HD brakes. 1 2 3

    By Jettech1,
    • 39 replies
    • 4.6k views

  18. gas vs diesel operating cost and mpg 1 2 3

    By 94yj,
    • 39 replies
    • 18.2k views

  19. TPMS Sensors with Advanced Trailering Package 1 2 3

    By bigman32hockey,
    • 39 replies
    • 34.7k views

  20. 2024 On Its Way 1 2 3

    By revrnd,
    • 39 replies
    • 5.1k views

  21. What Triggers "Check Trailer Wiring" DIC Message 1 2 3

    By Wxman,
    • 39 replies
    • 123.1k views

  22. Dual Battery Question 1 2 3

    By revrnd,
    • 38 replies
    • 9.6k views

  23. Ordered my retirement truck 1 2 3

    By Fishfighter,
    • 38 replies
    • 5.4k views

  24. 2024 rocker panel paint 1 2 3

    By GmEnjoyer,
    • 37 replies
    • 12.8k views

  25. 2020 3500HD with heavy duty front spring package? 1 2 3

    By MrChips,
    • 37 replies
    • 32k views

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