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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.

2,739 topics in this forum

  1. Remote Start Occasionally Does Not Work

    By BlaineBug,
    • 12 replies
    • 10.8k views

  2. 2016 Silverado with Kumho MTs

    By slvrsky07,
    • 13 replies
    • 3.4k views

  3. New to me truck, Error Code.....

    By zmwatson18,
    • 2 replies
    • 1.8k views

  4. Exhaust recommendations. 1 2

    By WilliamBos,
    • 16 replies
    • 4.4k views

  5. Wanting to change all fluids - this a good idea?

    By Waffle34,
    • 8 replies
    • 2k views

  6. Parts needed to do front and back re gear differentials

    By Brumageq,
    • 10 replies
    • 1.6k views

  7. Oil Filter Relocation Question for U Engine Guys 1 2

    By TxVet33,
    • 21 replies
    • 2.4k views

  8. LT5 TB to l83 Manifold adapter?

    By flyingfool,
    • 3 replies
    • 1.2k views

  9. My catch can experiment (L83) 1 2 3

    By SinisterZ71,
    • 33 replies
    • 29.5k views

  10. 2014 Drive belt replacement.

    By mongoose71,
    • 2 replies
    • 1.1k views

  11. Can you shorten a Corsa catback to work on a short bed?

    By 04GMshorty,
    • 2 replies
    • 818 views

  12. GDI Replacement

    By zzsnowman,
    • 1 reply
    • 1.4k views

  13. Transmission Purge and relearn function

    By flyingfool,
    • 1 reply
    • 1.1k views

  14. 2015 Silverado Lower control arm bolts and washers

    By jusd33,
    • 0 replies
    • 1.7k views

  15. 409 SS exhaust with Flowmaster muffler for $250

    By Ozer,
    • 11 replies
    • 2.1k views

  16. Exhaust Upgrade for 2019 Denali 6.2L

    By kris shirley,   
    • 7 replies
    • 5.3k views

  17. THrottle Re-learn Proceedure

    By flyingfool,
    • 9 replies
    • 70.9k views

  18. Gear change

    By cmysstailights,
    • 8 replies
    • 1k views

  19. 2016 transmission problems

    By Jupiter,
    • 2 replies
    • 1.6k views

  20. hollowing out the 3rd cat 1 2 3 4

    By desert,
    • 51 replies
    • 84.3k views

  21. 2019 Suburban Exhaust TIp(s)

    By ryabrams,   
    • 0 replies
    • 1.6k views

  22. 5.3 l83 6.2 L86 Cam Swap

    By Brooks Blake,   
    • 8 replies
    • 31.2k views

  23. Muffler Delete Flapper Question 1 2

    By tjd2003,
    • 21 replies
    • 14.3k views

  24. 6L80/6L90 Dismantle

    By Bob2C,
    • 0 replies
    • 700 views

  25. Is AMSOIL ATF preferred for the 6L80E? 1 2 3

    By Marztian,   
    • 30 replies
    • 49.9k views

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