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2015-2019 Silverado HD, Sierra HD & Medium Duty

The heavy haulers. Discussion for the 2500HD / 3500HD and the 4500HD / 5500HD / 6500HD chassis cabs.

Subforums

  1. Modifications & Accessories

    Bumpers, towing mirrors, and suspension upgrades.

    10.3k
    posts

  2. Troubleshooting & Recalls

    Diagnose DEF heater failures, CP4 pumps, and electrical issues.

    5.4k
    posts

  3. Engines & Powertrain (Duramax & Vortec)

    Technical discussion for the 6.6L Duramax (LML / L5P) and the 6.0L Gas V8 (L96 / LC8). Covers the Allison 1000 and 6L90 transmissions.

    2.8k
    posts

1,665 topics in this forum

  1. opinions on these led lights

    By 94yj,
    • 10 replies
    • 2.9k views

  2. New software update

    By Jacob007,
    • 8 replies
    • 2.3k views

  3. 2016 GMC Denali HD 6.0L..good deal or no?

    By Libtech29,
    • 12 replies
    • 1.9k views

  4. LCA bump stops

    By CO-Stark,
    • 10 replies
    • 29.2k views

  5. 3 Options for CAI/Resonator Delete.

    By mayer7196,
    • 3 replies
    • 1.6k views

  6. trailer mirror turn signal harness

    By dynoray,
    • 2 replies
    • 782 views

  7. Leveled on 35s pics

    By RJP44,
    • 6 replies
    • 1.5k views

  8. CV and Ball Joint angles after Upper control arms

    By RJP44,
    • 9 replies
    • 14.2k views

  9. Hood weather strip / sealing strip sticky gone

    By dave_clt,
    • 5 replies
    • 17.8k views
    • ESMD
    • ESMD

  10. Picking the right adjustable drop hitch

    By Icutmetl,
    • 13 replies
    • 16.4k views

  11. New owner 1 2

    By Dans Denali,
    • 19 replies
    • 2.7k views

  12. No BS Opinion Needed

    By tripleb,
    • 13 replies
    • 1.8k views

  13. OBD II Scanner

    By gmcleer,
    • 5 replies
    • 17k views

  14. Safety Chains with Stock Hitch 1 2

    By brclark82,
    • 25 replies
    • 25.8k views

  15. Newb to Diesel

    By Ron505,
    • 3 replies
    • 814 views

  16. Bluetooth won’t connect.

    By Jeditor,
    • 1 reply
    • 2.8k views

  17. Selling Duramax and getting a Denali XL

    By avalonandl,
    • 1 reply
    • 828 views

  18. OBD to change tire size?

    By gmcleer,
    • 1 reply
    • 7.1k views

  19. Braking Problems - Stabiltrac / Traction Control System

    By STANLEY,
    • 1 reply
    • 611 views

  20. 4.10 to 4.88?

    By zen720,
    • 5 replies
    • 3.9k views

  21. Under body/Chasis Oil treatment

    By Dirty5P,
    • 11 replies
    • 2.4k views

  22. 2019- 2500 High Country Question... dealer playing games?

    By mattsvtcobra,
    • 6 replies
    • 960 views

  23. Left over 2019 2500 denali diesel

    By black3.5z,
    • 11 replies
    • 3.8k views

  24. 2015 GMC 3500HD TPMS

    By Tommy Romeo,
    • 3 replies
    • 674 views

  25. Tuning 6.0 and longevity 1 2

    By GTBensley,
    • 22 replies
    • 15.5k views

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