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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.

2,728 topics in this forum

  1. Exhaust

    By fordsmt,
    • 2 replies
    • 876 views

  2. Instant Shutter Fix 8 speed 1 2

    By High Country 6.2L/8,
    • 25 replies
    • 24k views

  3. 8L90E replacement

    By Just 1 More,
    • 2 replies
    • 1.5k views

  4. 5.3 Exhaust manifold heat shield bolt part number

    By movario,
    • 6 replies
    • 6.7k views

  5. PF63 vs PF63E Oil Filter

    By 442olds,
    • 4 replies
    • 16.7k views

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

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

  7. LV3 balance shaft

    By Lee Thompson,
    • 0 replies
    • 1.5k views

  8. P06DD - Oil Pump Failure Findings

    By agentf,
    • 4 replies
    • 5.8k views

  9. Performance Spark Plug Wires

    By SARNCAN,
    • 13 replies
    • 14.3k views

  10. Transmission Fluid 1 2 3

    By Vom Breezy,
    • 36 replies
    • 6.8k views

  11. 2018 electronic struts and shocks

    By Joseph McBride,
    • 0 replies
    • 577 views

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

    By GsBowtie,
    • 48 replies
    • 29.8k views

  13. 2016 Yukon Denali 6.2L - Camshaft Actuator repair

    By Tmirk,
    • 0 replies
    • 1.1k views

  14. Please help with 4.3L HP increase? 1 2 3 4 5

    By TomBrady80,   
    • 73 replies
    • 70.1k views

  15. Intake swap tuning

    By Tech89,
    • 4 replies
    • 5.3k views

  16. 17’ GMC 6.2 Whipple keeps blowing rear main seal 1 2

    By Tanner Smith,
    • 15 replies
    • 8.7k views

  17. 2018 Chevy Silverado rear end clunk

    By 18ltz19,
    • 1 reply
    • 909 views

  18. Why does my 2500 scan a 3500

    By Jennifer432,
    • 2 replies
    • 593 views

  19. Oil Question

    By cjlet,
    • 11 replies
    • 1.8k views

  20. 2017 Silverado 5.3 - v4 rumbling/clanking

    By Dpbeats11,
    • 3 replies
    • 883 views

  21. 6L80/90 do you have a problem?

    By pokismoki,
    • 6 replies
    • 1.5k views

  22. 2014 Chevy Silverado - Oil pressure problem?

    By andiegirl,
    • 4 replies
    • 15k views

  23. Transmission Fluid

    By Vom Breezy,
    • 1 reply
    • 977 views

  24. Oil burning, where is it going? 1 2 3

    By truckguy82,
    • 35 replies
    • 11.8k views

  25. Rear-end clunk

    By ChaseC,
    • 0 replies
    • 812 views
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