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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. 2016 Silverado-5.3-Muffler Delete done. Should I delete 3rd cat?

    By SMID333,
    • 10 replies
    • 10k views

  2. Front/Rear Differential & Transfer case service, almost $600

    By No Tyme,
    • 13 replies
    • 9k views

  3. About to purchase first GM truck. Going for a 2018 Silverado LTZ. 6 or 8 Speed?

    By probablyflying,   
    • 2 replies
    • 2.3k views

  4. About to purchase first GM truck. Going for a 2018 Silverado LTZ. 6 or 8 Speed?

    By probablyflying,   
    • 0 replies
    • 2.4k views

  5. Fuel injector?

    By zac hale,
    • 5 replies
    • 949 views

  6. How to replace oil pump 6.2 L86

    By kgkern01,
    • 10 replies
    • 39.2k views

  7. Looking for recommendations and feedback for an l83 cam and tuner. Preferably remote if possible. NW IL

    By Alec Kerchner,
    • 0 replies
    • 736 views

  8. 2015 Sierra 6.2 has a new loud tick when warm

    By kojimep,
    • 11 replies
    • 6.2k views

  9. Tri-pot fuel pump problems?

    By mmrbad,
    • 1 reply
    • 766 views

  10. Jet performance MAF sensor

    By flyingfool,
    • 13 replies
    • 19.8k views

  11. Fuel injector replacement 1 2 3

    By bronco351,
    • 39 replies
    • 124.5k views

  12. 2018 Silverado 5.3 with instant and violent stalls down the highway

    By DustinR18,   
    • 3 replies
    • 9.7k views

  13. Rear Differential Hum (doesn't know the words)

    By fastx021,
    • 2 replies
    • 864 views

  14. sure cool 6l80

    By plasteryou,
    • 5 replies
    • 1.8k views

  15. L96 questions 1 2

    By TheCaddyMan04,
    • 20 replies
    • 13.1k views

  16. Oil type for 2014 Sierra 5.3 1 2 3 4 8

    By Green 1364,
    • 113 replies
    • 116k views

  17. Looking for a shop around columbia / Sumter SC that does installs the actual AFM delete kits

    By boudan joe,
    • 4 replies
    • 1k views

  18. trans thermostat gaskets

    By plasteryou,
    • 2 replies
    • 1.9k views

  19. Transmission overheating 1 2 3

    By dsm1995gst,
    • 33 replies
    • 11.9k views

  20. Pcv push tab connections same from newest gen to last model?m

    By Patrick G,   
    • 0 replies
    • 921 views

  21. 2015 Sierra 6.2 DOD/AFM delete reliability?

    By kojimep,
    • 3 replies
    • 2.6k views

  22. Long-Term Torque Converter Replacement Feedback for M5U Transmissions

    By JoeT1224,
    • 0 replies
    • 1.1k views

  23. 5.3 fireing order

    By joshc64311,
    • 13 replies
    • 46.8k views

  24. Catch can lines were reversed for 100 miles?

    By Payton34,
    • 1 reply
    • 1k views

  25. should I turn off AFM again after new lifters installed

    By Payton34,
    • 2 replies
    • 1.7k views

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