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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.

    5.5k
    posts

1,787 topics in this forum

  1. 2020+ T1 Chevrolet/GMC HD Quick Reference Guide 1 2 3

    By newdude,   
    • 30 replies
    • 64.1k views

  2. 2024 HD orders / status 1 2 3 4 49

    By Agargano98,
    • 720 replies
    • 125.6k views

  3. 2020 HD picture Thread 1 2 3 4 39

    By CRApex,   
    • 576 replies
    • 233.7k views

  4. Inventory and ordering lead times 1 2 3 4 32

    By Rozz522,
    • 470 replies
    • 106.6k views

  5. 2020 TPMS/trailer cameras 1 2 3 4 18

    By sdelam,
    • 258 replies
    • 85.3k views

  6. Happy Birthday to me, 3500HD officially ordered! 1 2 3 4 16

    By FirstAscent,
    • 239 replies
    • 17k views

  7. CHECK YOUR DIFFS... 1 2 3 4 15

    By gemarsh,
    • 211 replies
    • 61.7k views

  8. Auxiliary Accessory Trailer Camera 1 2 3 4 12

    By Scott Perkins,
    • 169 replies
    • 143.8k views

  9. Upfitter switches 1 2 3 4 10

    By Truckchauffeur,
    • 146 replies
    • 167.7k views

  10. Factory 5th wheel prep 1 2 3 4 10

    By powerhaulic,
    • 143 replies
    • 81.1k views

  11. 2020 HD Ordering Updates, 2019 HD Production End Dates 1 2 3 4 10

    By newdude,   
    • 141 replies
    • 40.1k views

  12. 6.6 gas 1 2 3 4 9

    By gearheadesw,
    • 132 replies
    • 66.3k views

  13. 2020 HD Plant Production 1 2 3 4 9

    By Pate Services,
    • 131 replies
    • 21.5k views

  14. 2500hd gasser 1 2 3 4 9

    By Lpfm1990,
    • 126 replies
    • 12.1k views

  15. 6.6 Gas MPG 1 2 3 4 9

    By brendon444,
    • 124 replies
    • 179.8k views

  16. The Inevitable Comparison: GM 6.6 vs. Ford 7.3 1 2 3 4 9

    By C/K Man,
    • 120 replies
    • 77.6k views

  17. BCGM Truck Purchased 1 2 3 4 7

    By BCGM,
    • 104 replies
    • 8.9k views

  18. Target Production Week Has Arrived! 1 2 3 4 7

    By cdnSpinalTap,
    • 97 replies
    • 17.3k views

  19. What do you tow with your beast? Pics and experience please.... 1 2 3 4 7

    By Jettech1,
    • 93 replies
    • 16.8k views

  20. The same new emissions that are destroying the motorhome chassis are coming to HD's 1 2 3 4 7

    By 64BAwagon,
    • 93 replies
    • 7.3k views

  21. I'm so confused....I don't want to let my beloved gasser go.... 1 2 3 4 6

    By Jettech1,
    • 89 replies
    • 10.1k views

  22. 2022 GMC Sierra 1500 and others BCM footwell lighting pinout - Denali Doorsill Install Info 1 2 3 4 6

    By matt99199,
    • 84 replies
    • 52.7k views

  23. Drivability of 6.6L gas 2500 vs 6.2L 1500 1 2 3 4 6

    By RE1,
    • 83 replies
    • 121.1k views

  24. GM Sold Me A Chunk Of Rust With A Truck Around it 1 2 3 4 6

    By Tahoe Tuff,
    • 82 replies
    • 24.4k views

  25. Trying to order new 3500... Not having any luck. 1 2 3 4 6

    By RGDD,
    • 81 replies
    • 7.9k views
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