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Engines & Drivetrain

Tech for the 5.3L (L83), 6.2L (L86), and 4.3L V6. Tuning and 6L80 / 8L90 transmission support.

2,740 topics in this forum

  1. Dyno Numbers

    By Justheman80,
    • 2 replies
    • 1.1k views

  2. 4.3 V6 Engine oil dipstick.

    By Donstar,
    • 14 replies
    • 9.9k views

  3. Def

    By Randy A,
    • 0 replies
    • 422 views

  4. E4500 odd issue starting truck - what's wrong ??

    By GM GR,
    • 1 reply
    • 543 views

  5. When Should I sell my (I mean disable DOD/AFM on) 2014 High Country with 5.3L L83?

    By TedH,
    • 8 replies
    • 6.2k views

  6. Gen V 4.3 Trouble Free Mileage

    By Grumpy Bear,
    • 9 replies
    • 2.4k views

  7. Move over Defenders LTX, Newest Michelin Tire 1 2

    By TXGREEK,
    • 19 replies
    • 7.6k views

  8. Cylinder 5 misfire help 1 2

    By joshc64311,
    • 15 replies
    • 32.8k views

  9. What could this noise be???

    By Ec22champ,
    • 5 replies
    • 1.1k views

  10. Great web forum for Transmission issue

    By pokismoki,
    • 0 replies
    • 1.1k views

  11. 2016 Silverado High pitch sound???

    By Rickyace09,
    • 1 reply
    • 813 views

  12. Remanufactured transmission 1 2

    By AZfrank08,
    • 15 replies
    • 19.8k views

  13. Exhaust

    By fordsmt,
    • 2 replies
    • 910 views

  14. Instant Shutter Fix 8 speed 1 2

    By High Country 6.2L/8,
    • 25 replies
    • 24.8k views

  15. 8L90E replacement

    By Just 1 More,
    • 2 replies
    • 1.6k views

  16. 5.3 Exhaust manifold heat shield bolt part number

    By movario,
    • 6 replies
    • 7k views

  17. PF63 vs PF63E Oil Filter

    By 442olds,
    • 4 replies
    • 16.9k views

  18. Tow/Haul wont turn off in the engine. Button on the dash works just fine.

    By spencer.smith99,
    • 5 replies
    • 1.1k views

  19. LV3 balance shaft

    By Lee Thompson,
    • 0 replies
    • 1.5k views

  20. P06DD - Oil Pump Failure Findings

    By agentf,
    • 4 replies
    • 5.9k views

  21. Performance Spark Plug Wires

    By SARNCAN,
    • 13 replies
    • 14.8k views

  22. Transmission Fluid 1 2 3

    By Vom Breezy,
    • 36 replies
    • 7.1k views

  23. 2018 electronic struts and shocks

    By Joseph McBride,
    • 0 replies
    • 585 views

  24. Oil Viscosity.....GM and my local Service Manager 1 2 3 4

    By GsBowtie,
    • 48 replies
    • 30.1k views

  25. 2016 Yukon Denali 6.2L - Camshaft Actuator repair

    By Tmirk,
    • 0 replies
    • 1.1k views

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