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

    By hardcore-gm,
    • 21 replies
    • 9.6k views

  2. ARH Y-Pipe Low Clearance

    By Blue15,
    • 2 replies
    • 734 views

  3. Which brakes? 1 2 3

    By meirikm,
    • 33 replies
    • 8.9k views

  4. New member: 6.2L impressions

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

  5. engine knock 6.2

    By RH Eckensberger,
    • 1 reply
    • 738 views

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

    By 737mechanic,
    • 5 replies
    • 6.4k views

  7. 18 6L80 Fluid Change 1 2 3 4

    By bayouguy71,
    • 48 replies
    • 37.3k views

  8. Time Chain Replacement, when?

    By Ge0rge,
    • 2 replies
    • 1.1k views

  9. Exhaust Cutout

    By Goinovr,
    • 0 replies
    • 604 views

  10. Regearing for 35s with 8 speed

    By Justin88,   
    • 6 replies
    • 12.4k views

  11. Screen for radio on 2015 Sierra

    By TammyCowan,
    • 1 reply
    • 625 views

  12. Rear Driveshaft Replacement 1 2

    By Darksky,   
    • 23 replies
    • 22.5k views

  13. Whipple Bypass Vavle

    By m1c,
    • 2 replies
    • 1.7k views

  14. 4L60 transmission removal 2014

    By allenweigel,
    • 1 reply
    • 876 views

  15. Exhaust Mod's

    By rlcole321,
    • 10 replies
    • 2k views

  16. Class Action Lawsuit for Trans On GM Trucks?

    By JR03CHOPPER,
    • 7 replies
    • 4.3k views

  17. 2 Step on 5.3 Silverado

    By Erny415,   
    • 2 replies
    • 9.2k views

  18. Long Tube Header Nightmare

    By Big AP,
    • 8 replies
    • 2k views

  19. L5P Duramax

    By VNM28,
    • 1 reply
    • 685 views

  20. New to HPTuners. Looking to Tune 5.3L

    By john race,   
    • 3 replies
    • 14.1k views

  21. New to HPTuners. Looking to Tune 5.3L

    By john race,   
    • 0 replies
    • 917 views

  22. 17' GMC 6.2 Supercharged Crank case seal leak

    By Tanner Smith,
    • 7 replies
    • 1.3k views

  23. Torque value for the bolts that mount the front diff on 2018 Silverado 1500

    By dmatzinger,
    • 3 replies
    • 14.7k views

  24. 2015 Sierra 1500 5.3L V8, Qs about differential fluid change

    By Zhiyi Clement Fu,
    • 5 replies
    • 17.3k views

  25. J Pipe Resonator 1 2

    By bayouguy71,
    • 18 replies
    • 9.4k views
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