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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. XForce Varex Electronically Adjustable Baffle Muffler?

    By zippydoda201,
    • 3 replies
    • 2k views

  2. 2022 MQE 8 speed GM trans service at dealer

    By customboss,   
    • 6 replies
    • 13.3k views

  3. Valvomax oil drain void warranty 1 2

    By IH784,
    • 17 replies
    • 5k views

  4. Borla cat-back exhaust 1 2

    By BamX31,
    • 23 replies
    • 5.1k views

  5. 2019 Silverado LD showing P06DD

    By Dagwood Designs,
    • 2 replies
    • 1.2k views

  6. RPO Code Z85, What does it get you?

    By SteveDillon,
    • 9 replies
    • 39.5k views

  7. Can anyone help me identify what this may be.

    By ChaseCales,
    • 3 replies
    • 1.6k views

  8. 2022 Suburban 3.0 duramax oil consumption

    By EngineNoO9,
    • 8 replies
    • 11.5k views

  9. Oil Change on 2022 refresh Silverado.

    By RedLT,   
    • 8 replies
    • 19.1k views

  10. 2019-2022 exhaust sounds/DFM

    By HuskeyBoy,
    • 5 replies
    • 6.1k views

  11. Diesel acceleration at higher speeds

    By Mikedfw,
    • 3 replies
    • 1.8k views

  12. transmission fluid in coolant system

    By bill van nes,
    • 12 replies
    • 5.8k views

  13. 2020 Silverado 3500 with water in the transmission

    By Evan Shearer,
    • 3 replies
    • 770 views

  14. LZ0 Duramax predictions

    By 6sigma,
    • 7 replies
    • 3.8k views

  15. L87 fuel economy, what are you getting? 1 2

    By ThePearl,
    • 21 replies
    • 7.4k views

  16. Anyone done custom exhaust on a 2.7 yet? 1 2

    By Jricharc,
    • 17 replies
    • 32.2k views

  17. 2019+ Silverado/Sierra 1500 Air or Electronic Locker Options

    By AWS92,
    • 2 replies
    • 5k views

  18. GEAR RATIO CHARTS

    By GM Rat,
    • 14 replies
    • 8.7k views

  19. Vibration in Floorboard

    By Rhaboush,
    • 3 replies
    • 2.9k views

  20. I need gear ratio and tire help

    By GM Rat,
    • 4 replies
    • 1k views

  21. 2022 LM2 3.0 duramax cooling improvements

    By ReZpawN,
    • 0 replies
    • 1.2k views

  22. 3.0 Duramax Oil Pump Belt Replacement is cheaper than I thought

    By DemonWorks,   
    • 7 replies
    • 82.9k views

  23. S&B vs Cold Air Inductions Air Intake - Fuel Economy (MPG) 1 2 3 4 5

    By ls5454ss,
    • 63 replies
    • 43.7k views

  24. Lifter issue: TSB PIP5776E - published June 18 1 2 3 4 7

    By 1500guy,
    • 91 replies
    • 37.7k views

  25. 3.0 Duramax DEF gauge fluctuates a lot.

    By jlong1984,
    • 2 replies
    • 7.6k views
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