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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.

2,740 topics in this forum

  1. Torque converter

    By Max Raper,
    • 14 replies
    • 14.5k views

  2. Exhaust Adaptive Valve 1 2 3 4 10

    By MotoMedic,
    • 140 replies
    • 234.1k views

  3. New rear axle due to runout (Vibration issues)

    By movario,
    • 1 reply
    • 1.2k views

  4. Number of O2 Sensor on 2014-present GMC Sierra Models

    By noobauto,
    • 1 reply
    • 5.4k views

  5. S&B Cold Air Intake and check engine light

    By SoonerTA,
    • 11 replies
    • 19.9k views

  6. 2018 sierra 1500 denali suspension question

    By hackitz,
    • 3 replies
    • 1.3k views

  7. Lifter question

    By zac hale,
    • 1 reply
    • 1.5k views

  8. 2017 Chevy 3500 4x4

    By wdlittell,
    • 1 reply
    • 855 views

  9. Please help! 2015 GMC Sierra slt 6.2 misfire

    By Joseph J Pahler,
    • 12 replies
    • 11.8k views

  10. CORSA EXHAUST Problem... Calling all corsa trucks! 1 2

    By Nicholas La Croix,
    • 19 replies
    • 7.2k views

  11. 2018 Silverado 6spd hard downshift

    By Jeremy l Byrd,
    • 13 replies
    • 3.2k views

  12. Not impressed. 1 2

    By SWI712,
    • 26 replies
    • 3.7k views

  13. 2018 L83 Air leak noise...?

    By Jose Soto,
    • 7 replies
    • 2k views

  14. PCV - Catch Can - Vacuum Pump

    By Gandalf,
    • 5 replies
    • 4.9k views

  15. 2016 Silverado 1500 Fluid Capacities

    By 99silveradoz71,
    • 6 replies
    • 10k views

  16. Tuning longshot!

    By Bulldog2017,
    • 1 reply
    • 1.1k views

  17. 3.5 in exhaust 3 in muffler?

    By cbprov,
    • 3 replies
    • 2.2k views

  18. 2014 Sierra trans thermostat part numbers

    By RobbyDawg,
    • 9 replies
    • 3.4k views

  19. Oil/fuel vapor smell from ac vents

    By Payton34,
    • 2 replies
    • 2.3k views

  20. Replace my own rear pinion seal?

    By handyman58,
    • 7 replies
    • 12.2k views

  21. GM Performance Exhaust Muffler

    By shakenfake,
    • 13 replies
    • 4.2k views

  22. Leveling Kit - Upper Strut Spacers Vs. Lower Block Spacers 1 2

    By BlaineBug,
    • 24 replies
    • 26.4k views

  23. 2018 silverado 5.3l headers and catless y pipe

    By Chevyguyltz,
    • 4 replies
    • 5.2k views

  24. coil pack

    By 2015 sierra,
    • 6 replies
    • 1.5k views

  25. First time changing oil on this truck

    By TwentyEighthNight,   
    • 6 replies
    • 2.5k views
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