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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. Upgrading - OEM suspension options for 2015-2020 full-size SUV lineup?

    By BlaineBug,
    • 1 reply
    • 1.2k views

  2. Operating temp

    By Citykid,
    • 2 replies
    • 712 views

  3. It's my turn... (Transmission failure) 1 2

    By papageoff,
    • 15 replies
    • 2.7k views

  4. Seeking E85 Clarity for 6.2 L86

    By SkiDooNick700,
    • 11 replies
    • 3.4k views

  5. 2019 Chassis Swap with 2015 1 2

    By Jeff1978,
    • 22 replies
    • 2.8k views

  6. GM loses class action lawsuit on AFM/DOD or just a rumor ? 1 2

    By Beer Belly,
    • 18 replies
    • 22.8k views

  7. Intake / TB Swap and Walnut Blasting 2016 L83

    By Congtoid,
    • 0 replies
    • 725 views

  8. 6L80 Thermal Bypass Doesn't match videos for 'pill flip' or Shift Technology modification 1 2

    By Brian Maxwell,
    • 17 replies
    • 2.8k views

  9. Po422 and suspect weak fuel pump. 2017 chevy Silverado 5.3v8

    By Dallas Fisk,
    • 3 replies
    • 2.6k views

  10. Struggling torquing cylinder head down

    By brian.yi15,
    • 1 reply
    • 746 views

  11. 2016 5.3 Silverado Carven R series- Need advice / opinions

    By SMID333,
    • 2 replies
    • 1.2k views

  12. Looking for an old 6L80 transmission cooler bypass valve with quick connect fittings.

    By LilRedDave,
    • 0 replies
    • 488 views

  13. 2017 L83 6L80e Texas Speed Swap AFM Delete?

    By Hexa Fox,
    • 10 replies
    • 7.1k views

  14. 2019 Chevy 1500 5.3 liter. Weird sound

    By Logan717,
    • 0 replies
    • 487 views

  15. Can’t put gas in my tank

    By Shane Penny,
    • 4 replies
    • 751 views

  16. Ordering new 6L80 transmission.

    By BrizzoDaIzzo,
    • 4 replies
    • 5.2k views

  17. Best tuner for L86 6.2L / 8L90

    By 2018GMC,
    • 4 replies
    • 16.7k views

  18. Trans repair before there's an issue 1 2 3

    By Dieselcamino,
    • 31 replies
    • 6.1k views

  19. 2016 Silverado Chirping Noise

    By Falconsfan1988,
    • 14 replies
    • 21.3k views

  20. 2015 Sierra 5.3 and transmission pull

    By gbayfisher,   
    • 7 replies
    • 793 views

  21. 5.3 vortec to l83 turbo manifold

    By cian,
    • 2 replies
    • 968 views

  22. 5.3 vortec to l83 turbo manifold

    By cian,
    • 0 replies
    • 481 views

  23. Trailer break system/ truck turning off

    By Jhh1210,
    • 4 replies
    • 1.2k views

  24. 8 speed suddenly went out. No forward or reverse gears 1 2 3

    By kgkern01,
    • 44 replies
    • 22.8k views

  25. Need HELP P0203

    By carl mack,
    • 0 replies
    • 1k views
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