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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.

2,740 topics in this forum

  1. Whipple Bypass Vavle

    By m1c,
    • 2 replies
    • 1.8k views

  2. 4L60 transmission removal 2014

    By allenweigel,
    • 1 reply
    • 905 views

  3. Exhaust Mod's

    By rlcole321,
    • 10 replies
    • 2.1k views

  4. Class Action Lawsuit for Trans On GM Trucks?

    By JR03CHOPPER,
    • 7 replies
    • 4.4k views

  5. 2 Step on 5.3 Silverado

    By Erny415,   
    • 2 replies
    • 9.2k views

  6. Long Tube Header Nightmare

    By Big AP,
    • 8 replies
    • 2k views

  7. L5P Duramax

    By VNM28,
    • 1 reply
    • 716 views

  8. New to HPTuners. Looking to Tune 5.3L

    By john race,   
    • 3 replies
    • 14.8k views

  9. New to HPTuners. Looking to Tune 5.3L

    By john race,   
    • 0 replies
    • 938 views

  10. 17' GMC 6.2 Supercharged Crank case seal leak

    By Tanner Smith,
    • 7 replies
    • 1.4k views

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

    By dmatzinger,
    • 3 replies
    • 15k views

  12. 2015 Sierra 1500 5.3L V8, Qs about differential fluid change

    By Zhiyi Clement Fu,
    • 5 replies
    • 18.3k views

  13. J Pipe Resonator 1 2

    By bayouguy71,
    • 18 replies
    • 9.9k views

  14. Solo Perfomance Exhaust

    By Byrds8,
    • 0 replies
    • 822 views

  15. 2015 Sierra 6.2L Exhaust Manifold Bolts

    By heierlu,
    • 5 replies
    • 8.8k views

  16. Engine not getting to temp - Bad Cat

    By Silkside,
    • 1 reply
    • 1.6k views

  17. throwing codes after headers and tune

    By 2015 High Miler,
    • 6 replies
    • 4.4k views

  18. First 6.2 L86 cam replacement

    By MAC1911,
    • 1 reply
    • 7k views

  19. PF 63 oil filter

    By arcticatv,
    • 3 replies
    • 2.5k views

  20. Need advice: Replace or repair differential

    By langston1726,
    • 12 replies
    • 2.3k views

  21. Undermount Intake "Scoop"

    By KONGon22s,
    • 3 replies
    • 858 views

  22. Engine dyno tune 5.3 or 6.2 yet?

    By pokismoki,
    • 1 reply
    • 778 views

  23. Longtube Headers and Custom Magnaflow Exhaust

    By VdellaV,   
    • 6 replies
    • 5.9k views

  24. How To Check Fluid Level?

    By Evinruder,
    • 1 reply
    • 1.1k views

  25. “Lifetime warranty” Exhaust

    By Determined,   
    • 6 replies
    • 2.9k views
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