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Engines & Drivetrain (V8, Duramax, TurboMax)

Technical discussion for the 6.2L (L87), 5.3L (L84), 3.0L Duramax (LZ0/LM2), and 2.7L TurboMax. Tuning, maintenance, and 8-speed &10-speed transmission tech.

1,140 topics in this forum

  1. Replace thermostat 1 2

    By DHBWA,
    • 17 replies
    • 35.7k views
    • ces
    • ces

  2. 3.0 Duramax Shudder? 1 2

    By thegrizz,
    • 17 replies
    • 22.3k views

  3. How much coolant loss is normal?

    By ExYukon,
    • 8 replies
    • 2.2k views

  4. 6.2 and 5.3 owners without issues

    By ScathaTheWorm,
    • 9 replies
    • 2.3k views

  5. 3.0 Duramax High Idle Setting

    By Time2gofishing1980,
    • 12 replies
    • 53.5k views

  6. Speed limiter delete 1 2 3 4 7

    By Stephen L. Pannell,
    • 99 replies
    • 81.6k views

  7. Transmission temperature 10speed with 3.0 LZO Duramax 1 2 3 4

    By steve king,
    • 55 replies
    • 44.9k views

  8. 2023 5.3L Assessment

    By Jimbeau,
    • 12 replies
    • 1.8k views

  9. 2001 GMC 4.3 intake manifold

    By KillerKilgore,
    • 0 replies
    • 158 views

  10. Top Tier Gas 1 2 3 4 8

    By None12,
    • 109 replies
    • 19.9k views

  11. 2024 silverado 1500 8 speed.

    By 15 Z71,
    • 12 replies
    • 1.2k views

  12. 24 LZ0, 11K , just got a P0204 and P0304 - Injector 4 circuit & misfire

    By DubVBenz,
    • 1 reply
    • 1.1k views

  13. High mileage

    By Spayne1912,
    • 3 replies
    • 1k views

  14. 5.3 vs 3.0 longevity 1 2

    By ryanm33,
    • 24 replies
    • 10k views

  15. 2020 10 speed trans service question

    By johnnyquick,
    • 9 replies
    • 1.2k views

  16. Transmission temperature 235 10speed 3.0 LZO Duramax 2023

    By Dooklear,
    • 0 replies
    • 402 views

  17. 2024 Silverado 2.7l rear main leak

    By Tmh350,
    • 7 replies
    • 1.7k views

  18. 10 speed Transmission Hot - Please help 1 2 3 4 9

    By ArthurW,
    • 122 replies
    • 45.6k views

  19. 2.7L Turbomax teardown 1 2 3

    By GETGONE,
    • 30 replies
    • 5.3k views

  20. I screwed up. What are my 2020 6.2 replacement options?

    By nateg20,
    • 12 replies
    • 4k views

  21. AFM DOD delete

    By valric,
    • 4 replies
    • 4.5k views

  22. Exhaust Flapper Failure - Replace with Factory or Aftermarket?

    By tjonesdfw,
    • 7 replies
    • 2.4k views

  23. Has anyone used/installed this dipstick for the 8L90?

    By lennybg,
    • 1 reply
    • 735 views

  24. 2019 Denali 6.2 10 speed Brake controller 47,000 miles

    By cola,
    • 0 replies
    • 234 views

  25. Single factory to dual exhaust 1 2

    By 2liter,
    • 22 replies
    • 21.9k views
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