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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.

2,727 topics in this forum

  1. 6L80E transmission shift problem 1 2 3

    By Larsson,
    • 32 replies
    • 41.6k views

  2. Transmission hose/line identification

    By Datwhitez71,
    • 13 replies
    • 1.8k views

  3. 2017 Sierra SLE 5.3 back from tune 1 2 3 4

    By RMR,
    • 46 replies
    • 11.6k views

  4. Borla ATAK Exhaust & CAI

    By CrunchyBlack,
    • 10 replies
    • 4.5k views

  5. Second 6l80 trans died today 1 2 3

    By 2015 High Miler,
    • 36 replies
    • 5.6k views

  6. E85 14’ sierra 4.3 Run e85 or stick with regular gass

    By TwentyEighthNight,   
    • 8 replies
    • 8.5k views

  7. 2017 Silverado 1500 - LT to LS 427 engine Swap 1 2 3

    By Blackwidow_Chevy,   
    • 37 replies
    • 19.8k views

  8. Pacesetter Headers?

    By SeekAndDestroy,
    • 13 replies
    • 3.7k views

  9. 2016 5.3l oil pressure change

    By olerodder,
    • 11 replies
    • 19.6k views

  10. Turbowerx Pump Issue

    By Regan Menzies,
    • 0 replies
    • 559 views

  11. 2015 Chevy Silverado 5.3 Oil Pan Gasket (Help finding part Number)

    By GoneGetSMOKED,
    • 3 replies
    • 7.2k views

  12. Any high mileage guys towing travel trailers? 1 2

    By RPaul,
    • 16 replies
    • 2.2k views

  13. 8spd transmission w/ lift kit and larger tires

    By GraphiteSilveradoZ71,
    • 6 replies
    • 1.5k views

  14. Im sorry, but it is kind of funny GM 21-NA-199 1 2 3 4 14

    By 14burrito,
    • 198 replies
    • 53.2k views

  15. 2017 L83 DOD delete

    By mrpj1972,
    • 7 replies
    • 1.8k views

  16. Another Long Tube question...

    By Husker_1911,   
    • 11 replies
    • 16.1k views

  17. 16 Silverado 5.3L mods & tuning help

    By Rockstar1,   
    • 3 replies
    • 6.2k views

  18. 2017 GMC Sierra Z71 Rear Diff Cover Bolt Torque

    By Jim Cathey,
    • 2 replies
    • 1.2k views

  19. DOD delete parts/uprades?

    By cobrajay,
    • 2 replies
    • 1.4k views

  20. Corvette LT1 Fuel Rail Covers on L86

    By James Beyer,
    • 3 replies
    • 2.3k views

  21. 2019 gmc 2500 4x4 6.0l fuel pump not working

    By casperf,
    • 2 replies
    • 716 views

  22. L86 vs LT1 vs LT2 1 2 3 4 6

    By M1ck3y,
    • 75 replies
    • 50.8k views

  23. Gas in Engine Oil - HPFP or Injectors to Blame?

    By SnakNest,
    • 12 replies
    • 12.5k views

  24. AFM Lifter Tick

    By DCazares,
    • 1 reply
    • 1.5k views

  25. Torque Converter - 1500

    By laminarflow,
    • 1 reply
    • 1.2k views
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