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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.

2,739 topics in this forum

  1. Harmonic balancer bolt

    By Blackwidow_Chevy,
    • 13 replies
    • 36.6k views

  2. 2018 1500 rear axle swap 4.3l 8.6" on to 5.3L 9.5" any reason I can't?

    By doubeleive,
    • 3 replies
    • 1.1k views

  3. 2014 Sierra 6.2 Dyno 1 2 3

    By Jjblur2003,
    • 32 replies
    • 12.1k views

  4. Beating a dead horse, exhaust.

    By 2015 High Miler,
    • 5 replies
    • 1.7k views

  5. P0420

    By Black Mamba,
    • 9 replies
    • 1.5k views

  6. DIY stainless catback

    By langston1726,
    • 9 replies
    • 5k views

  7. L83 5.3L Flex fuel conversion with Dyno sheets. Followed with tune and more dyno sheets. 1 2 3 4

    By Alec Kerchner,
    • 59 replies
    • 37k views

  8. Costco oil?? 1 2

    By Grumpytoast92,
    • 15 replies
    • 7.4k views

  9. 2014 GMC Sierra 5.3l 6 Speed Delayed Shifting

    By Ryan Amey,   
    • 2 replies
    • 5.1k views

  10. 2018 silverado 5.3 LT z81 Texas edition

    By Jones Cody 8020,
    • 3 replies
    • 2.3k views

  11. L83 5.3L E85 conversion. OEM fuel lines, no splice. Warning inside.

    By Alec Kerchner,
    • 1 reply
    • 2.7k views

  12. 2014 Silverado 5.3 L83 bad lifter

    By 15foxrzr,
    • 4 replies
    • 4.1k views

  13. 2015 Silverado 5.3 Engine Rebuild

    By rab356,
    • 7 replies
    • 6.6k views

  14. Front and rear differential service maintenance schedule

    By askibum02,
    • 12 replies
    • 38.1k views

  15. 2018 V-6 GDI and fuel pressure sensor

    By Mike red hot silverado,
    • 1 reply
    • 460 views

  16. 2015 8L90 Trans Fluid Temp Sensor & Harness

    By SizzlingSkilletz,   
    • 1 reply
    • 5.9k views

  17. Need Advice on Aftermarket Cam Options 1 2

    By Truckboattruck,
    • 24 replies
    • 4.3k views

  18. Circle D convertor 1 2

    By 6.2Midnight,
    • 15 replies
    • 3.1k views

  19. Leaking valve cover gasket?

    By Gary Shull,
    • 3 replies
    • 11.6k views

  20. Startup Tick

    By gburns,
    • 4 replies
    • 1.3k views

  21. Diablo Sport - increasing trans pressure

    By 14burrito,
    • 4 replies
    • 4.1k views

  22. AFM Federal Class Action Law Suit Filed 2104-2021 GM Engines

    By MilwPaul,
    • 1 reply
    • 4.9k views

  23. Pinging on 87 1 2

    By dvzzz,
    • 19 replies
    • 9.9k views

  24. Blown 6.2 L86

    By Bobby Fields,
    • 7 replies
    • 3.5k views

  25. 2017 silverado 5.3 6L80E

    By Stownse,
    • 7 replies
    • 1.9k views

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