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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.

2,728 topics in this forum

  1. replacement for corsa sport muffler 1 2

    By johnk45,   
    • 24 replies
    • 7.5k views

  2. Question about diablo i3 vs predator

    By Bammer25,
    • 10 replies
    • 5.1k views

  3. Stalled up or off idle??

    By Gorske,
    • 3 replies
    • 854 views

  4. Vacuum port for Seafoam

    By Jim Schmidt,
    • 1 reply
    • 1.5k views

  5. how much of a over bore will the L83 take

    By J.R.,
    • 4 replies
    • 16.6k views

  6. 2014 GMC Sierra Transmission Issues & Warranty

    By str8304,
    • 2 replies
    • 10.8k views

  7. ProCharger/Black Widow 250 muffler WOT video

    By Gorske,
    • 7 replies
    • 989 views

  8. posi rear end

    By Trigger man,
    • 9 replies
    • 12.8k views

  9. 2015 Rear Gear Swap

    By jackgraves,
    • 2 replies
    • 901 views

  10. Gear Change 9.5" 12 bolt 1 2 3 4 9

    By CAtaylor,
    • 131 replies
    • 65k views

  11. OBX and Maximizer Long Tube Headers -- Anyone?

    By nando87,
    • 13 replies
    • 12.5k views

  12. HELP! High oil level

    By 14SierraZ71,   
    • 5 replies
    • 4.2k views

  13. Help identify this noise

    By MugsyMalone,
    • 0 replies
    • 451 views

  14. Did the dealer leave my TCM unlocked??

    By emeryz28,
    • 9 replies
    • 5.4k views

  15. My '18 6.2 has a 5.3 intake box

    By SILVER SLED,
    • 3 replies
    • 1.2k views

  16. Did bigger tires make my truck slower? 1 2

    By Gorske,
    • 17 replies
    • 6.9k views

  17. Muffler install

    By Bammer25,
    • 5 replies
    • 1.2k views

  18. Battle of the flows (muffler choice)

    By Roscopcoletrain,
    • 12 replies
    • 3.1k views

  19. The new exhaust flapper design 1 2 3 4 5

    By ShamrockShooter,
    • 72 replies
    • 53.7k views

  20. Diablew/Blackbear vs custom dyno tune after header install

    By vinnyr27,
    • 8 replies
    • 5.4k views

  21. Rear swaybar and rear 5100's installed...

    By Sooperdave,
    • 13 replies
    • 4.2k views

  22. Tune

    By cmysstailights,
    • 2 replies
    • 581 views

  23. Thoughts on this tip?

    By Roscopcoletrain,
    • 5 replies
    • 805 views

  24. Concerning Lifter Noise and Whining noise 1 2

    By ObscureGlock,   
    • 15 replies
    • 12.8k views

  25. Driveline vibration

    By Luistt,   
    • 1 reply
    • 3.1k views
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