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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.

2,731 topics in this forum

  1. 17' GMC 6.2 Supercharged Crank case seal leak

    By Tanner Smith,
    • 7 replies
    • 1.4k views

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

    By dmatzinger,
    • 3 replies
    • 14.8k views

  3. 2015 Sierra 1500 5.3L V8, Qs about differential fluid change

    By Zhiyi Clement Fu,
    • 5 replies
    • 17.7k views

  4. J Pipe Resonator 1 2

    By bayouguy71,
    • 18 replies
    • 9.6k views

  5. Solo Perfomance Exhaust

    By Byrds8,
    • 0 replies
    • 788 views

  6. 2015 Sierra 6.2L Exhaust Manifold Bolts

    By heierlu,
    • 5 replies
    • 8.6k views

  7. Engine not getting to temp - Bad Cat

    By Silkside,
    • 1 reply
    • 1.6k views

  8. throwing codes after headers and tune

    By 2015 High Miler,
    • 6 replies
    • 4.3k views

  9. First 6.2 L86 cam replacement

    By MAC1911,
    • 1 reply
    • 7k views

  10. PF 63 oil filter

    By arcticatv,
    • 3 replies
    • 2.5k views

  11. Need advice: Replace or repair differential

    By langston1726,
    • 12 replies
    • 2.2k views

  12. Undermount Intake "Scoop"

    By KONGon22s,
    • 3 replies
    • 836 views

  13. Engine dyno tune 5.3 or 6.2 yet?

    By pokismoki,
    • 1 reply
    • 763 views

  14. Longtube Headers and Custom Magnaflow Exhaust

    By VdellaV,   
    • 6 replies
    • 5.8k views

  15. How To Check Fluid Level?

    By Evinruder,
    • 1 reply
    • 1.1k views

  16. “Lifetime warranty” Exhaust

    By Determined,   
    • 6 replies
    • 2.8k views

  17. 5.3 Liter Oil Level/Dipstick Reading?

    By sourdough44,
    • 7 replies
    • 29k views

  18. Anyone driving at higher elevations?

    By BKK,
    • 7 replies
    • 1.7k views

  19. 2015 Denali Differentials and Transfer Case Oil Changes - pics

    By SuperOldSchool,   
    • 1 reply
    • 1.3k views

  20. Another trans bites the dust

    By KONGon22s,   
    • 7 replies
    • 4k views

  21. GM Borla Making Strange Noise 1 2

    By ShamrockShooter,
    • 25 replies
    • 8k views

  22. Question on AFM collapsed lifter failure 1 2 3

    By Doublebase,   
    • 41 replies
    • 56.7k views

  23. 2016 Silverado Transmission Failure 1 2

    By 69hdflh,
    • 17 replies
    • 13.9k views

  24. 2018 Silverado loss of power with exhaust??

    By Christian Olguin,
    • 12 replies
    • 5k views

  25. Strange exhaust sound

    By Rodger Baer,
    • 4 replies
    • 1.1k views
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