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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. FS: LT1 and LT4 injectors and pumps

    By SNSTRSS,
    • 0 replies
    • 691 views

  2. Elevated idle / best tuners for mpg

    By jacob keese,   
    • 2 replies
    • 1.4k views

  3. Rev Limiter 1 2

    By Ge0rge,
    • 28 replies
    • 18.8k views

  4. 2018 Silverado 1500 External Transmission Cooler? 1 2

    By BillNC,   
    • 18 replies
    • 48.5k views

  5. 2014 GMC Sierra 1500 p0430

    By thebayvie,
    • 6 replies
    • 2.1k views

  6. Transmission gone 106k 2017 Sierra

    By DeePa,
    • 12 replies
    • 3.2k views

  7. 2017 Transmission Failed...

    By jaysolo,
    • 5 replies
    • 1.6k views

  8. 5.3 wiped out lifter. Fix?

    By Aharp,
    • 5 replies
    • 1.2k views

  9. 2014 Chevy Silverado Transmission Gone

    By BigCaliLTZ,
    • 1 reply
    • 1.1k views

  10. Torque converter

    By d55olds1,
    • 13 replies
    • 6.5k views

  11. 2015 5.3L P0300 and other issues

    By Paul Dwyer,
    • 7 replies
    • 9.4k views

  12. Code P0420 on 2016 LTZ chevy silverado

    By Sambo Lester,
    • 2 replies
    • 1.2k views

  13. Need help to quiet down LT headers w/ Corsa catback 1 2

    By hardcore-gm,
    • 21 replies
    • 9.9k views

  14. ARH Y-Pipe Low Clearance

    By Blue15,
    • 2 replies
    • 758 views

  15. Which brakes? 1 2 3

    By meirikm,
    • 33 replies
    • 9.1k views

  16. New member: 6.2L impressions

    By Adam in WI,
    • 6 replies
    • 1.3k views

  17. engine knock 6.2

    By RH Eckensberger,
    • 1 reply
    • 745 views

  18. For the people who do their own oil changes I made a custom 3d printable funnel.

    By 737mechanic,
    • 5 replies
    • 6.7k views

  19. 18 6L80 Fluid Change 1 2 3 4

    By bayouguy71,
    • 48 replies
    • 38.3k views

  20. Time Chain Replacement, when?

    By Ge0rge,
    • 2 replies
    • 1.1k views

  21. Exhaust Cutout

    By Goinovr,
    • 0 replies
    • 616 views

  22. Regearing for 35s with 8 speed

    By Justin88,   
    • 6 replies
    • 12.6k views

  23. Screen for radio on 2015 Sierra

    By TammyCowan,
    • 1 reply
    • 636 views

  24. Rear Driveshaft Replacement 1 2

    By Darksky,   
    • 23 replies
    • 22.7k views

  25. Whipple Bypass Vavle

    By m1c,
    • 2 replies
    • 1.7k views
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