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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. Solo Perfomance Exhaust

    By Byrds8,
    • 0 replies
    • 780 views

  2. 2015 Sierra 6.2L Exhaust Manifold Bolts

    By heierlu,
    • 5 replies
    • 8.5k views

  3. Engine not getting to temp - Bad Cat

    By Silkside,
    • 1 reply
    • 1.6k views

  4. throwing codes after headers and tune

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

  5. First 6.2 L86 cam replacement

    By MAC1911,
    • 1 reply
    • 6.9k views

  6. PF 63 oil filter

    By arcticatv,
    • 3 replies
    • 2.4k views

  7. Need advice: Replace or repair differential

    By langston1726,
    • 12 replies
    • 2.2k views

  8. Undermount Intake "Scoop"

    By KONGon22s,
    • 3 replies
    • 804 views

  9. Engine dyno tune 5.3 or 6.2 yet?

    By pokismoki,
    • 1 reply
    • 751 views

  10. Longtube Headers and Custom Magnaflow Exhaust

    By VdellaV,   
    • 6 replies
    • 5.7k views

  11. How To Check Fluid Level?

    By Evinruder,
    • 1 reply
    • 1.1k views

  12. “Lifetime warranty” Exhaust

    By Determined,   
    • 6 replies
    • 2.8k views

  13. 5.3 Liter Oil Level/Dipstick Reading?

    By sourdough44,
    • 7 replies
    • 28.9k views

  14. Anyone driving at higher elevations?

    By BKK,
    • 7 replies
    • 1.6k views

  15. 2015 Denali Differentials and Transfer Case Oil Changes - pics

    By SuperOldSchool,   
    • 1 reply
    • 1.2k views

  16. Another trans bites the dust

    By KONGon22s,   
    • 7 replies
    • 3.9k views

  17. GM Borla Making Strange Noise 1 2

    By ShamrockShooter,
    • 25 replies
    • 8k views

  18. Question on AFM collapsed lifter failure 1 2 3

    By Doublebase,   
    • 41 replies
    • 56.4k views

  19. 2016 Silverado Transmission Failure 1 2

    By 69hdflh,
    • 17 replies
    • 13.5k views

  20. 2018 Silverado loss of power with exhaust??

    By Christian Olguin,
    • 12 replies
    • 4.9k views

  21. Strange exhaust sound

    By Rodger Baer,
    • 4 replies
    • 1.1k views

  22. 2017 GMC Sierra Denali transmission & drivers seat issues. Help with warranty

    By mattarmstr,
    • 0 replies
    • 1k views

  23. Engine swap

    By Truckguy567,
    • 1 reply
    • 1k views

  24. 2014 Silverado 1500 2wd U joint size

    By Todd1982,
    • 3 replies
    • 6.2k views

  25. P0740 and High Trans Temp

    By Jonathan Annear,
    • 8 replies
    • 1.3k views

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