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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. DOD/AFM Delete kits

    By BumpStop97,
    • 4 replies
    • 2.8k views

  2. Which Axle 9.75 or 9.5 1 2 3

    By Antoine08,
    • 42 replies
    • 59.3k views

  3. Stock Exhaust Back Pressure??? 1 2 3

    By BuyAmericanIron,
    • 43 replies
    • 22.9k views

  4. collapsed lifter with rocker arm still moving?

    By tig488,
    • 3 replies
    • 4.4k views

  5. 3.08 to 4.56 Gear swap issues? - 6.2 Tahoe 2018

    By Cort Liggins,
    • 1 reply
    • 1.2k views

  6. What should I do to solve the issues of the 2014 Sierra?

    By Bradmodsierra,
    • 8 replies
    • 1.7k views

  7. 6l80E reset after fluid/filter change?

    By Outlaww,
    • 4 replies
    • 7.9k views

  8. Ticking Sound Increasing with RPM - Lifter Problem?

    By Western96,
    • 6 replies
    • 5.6k views

  9. Thermostat problem? 1 2

    By Lspoo19,
    • 21 replies
    • 29.5k views

  10. 2018 Silverado WT Transmission Cooler Lines

    By BowTi3Guy,
    • 3 replies
    • 1.1k views

  11. Which afm delete kit?

    By Payton34,
    • 13 replies
    • 78.2k views

  12. For those of you who have installed a drain plug in your Transmission 1 2

    By No Tyme,
    • 18 replies
    • 4.7k views

  13. Need help figuring out which Rear Driveshaft to order?

    By Texasdeere,
    • 2 replies
    • 1k views

  14. 2014 Transmission cooler lines

    By lpramirez,
    • 3 replies
    • 2.1k views

  15. 2017 Chevy Silverado Thermostat Running Cold 1 2

    By HuntedOne4,   
    • 16 replies
    • 36.1k views

  16. Replacing OE Converter with Circle D - Stock Stall Speed with Billet Cover - Help Needed Can't Find an Installer

    By beamjp,
    • 0 replies
    • 1.3k views

  17. Engine thermostat technical design question.

    By Outdoors_Guy_88,
    • 0 replies
    • 1.1k views

  18. Fuel problems/electrical.

    By Alex Rivas,
    • 0 replies
    • 982 views

  19. 2014 Sierra 4.3 LV3 to 5.3 or 6.2?

    By VicSier43,
    • 1 reply
    • 1.7k views

  20. 2014 GMC Sierra SLT Transmission shudder/stutters when trying to shift up in gear

    By Travis Cooper,   
    • 4 replies
    • 17.7k views

  21. Public Service Announcement - 2014-2018 Oil Pump Concerns P06DD

    By David Coates,
    • 1 reply
    • 1.7k views

  22. Looking to add a transmission temp to my 2017 Silverado 2 wheel drive with 6 speed trans

    By 1moreminute,
    • 2 replies
    • 942 views

  23. Rear axle shaft bearing

    By movario,
    • 3 replies
    • 3.4k views

  24. Catch Can results

    By martin31636,
    • 3 replies
    • 1.4k views

  25. L83 SWAP TO L86 Anyone done it? 1 2 3

    By Norcent,
    • 32 replies
    • 22.8k views

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