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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.

2,730 topics in this forum

  1. 2018 Silverado 6spd hard downshift

    By Jeremy l Byrd,
    • 13 replies
    • 3.1k views

  2. Not impressed. 1 2

    By SWI712,
    • 26 replies
    • 3.6k views

  3. 2018 L83 Air leak noise...?

    By Jose Soto,
    • 7 replies
    • 1.9k views

  4. PCV - Catch Can - Vacuum Pump

    By Gandalf,
    • 5 replies
    • 4.9k views

  5. 2016 Silverado 1500 Fluid Capacities

    By 99silveradoz71,
    • 6 replies
    • 9.8k views

  6. Tuning longshot!

    By Bulldog2017,
    • 1 reply
    • 1.1k views

  7. 3.5 in exhaust 3 in muffler?

    By cbprov,
    • 3 replies
    • 2.1k views

  8. 2014 Sierra trans thermostat part numbers

    By RobbyDawg,
    • 9 replies
    • 3.4k views

  9. Oil/fuel vapor smell from ac vents

    By Payton34,
    • 2 replies
    • 2.3k views

  10. Replace my own rear pinion seal?

    By handyman58,
    • 7 replies
    • 11.8k views

  11. GM Performance Exhaust Muffler

    By shakenfake,
    • 13 replies
    • 4.1k views

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

    By BlaineBug,
    • 24 replies
    • 25.2k views

  13. 2018 silverado 5.3l headers and catless y pipe

    By Chevyguyltz,
    • 4 replies
    • 5.1k views

  14. coil pack

    By 2015 sierra,
    • 6 replies
    • 1.4k views

  15. First time changing oil on this truck

    By TwentyEighthNight,   
    • 6 replies
    • 2.5k views

  16. OIL psi jumps from 40 to 50 for a sec while cruising at 70mph

    By Payton34,
    • 8 replies
    • 1.2k views

  17. 2016 Silverado-5.3-Muffler Delete done. Should I delete 3rd cat?

    By SMID333,
    • 10 replies
    • 9.9k views

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

    By No Tyme,
    • 13 replies
    • 8.4k views

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

    By probablyflying,   
    • 2 replies
    • 2.3k views

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

    By probablyflying,   
    • 0 replies
    • 2.4k views

  21. Fuel injector?

    By zac hale,
    • 5 replies
    • 936 views

  22. How to replace oil pump 6.2 L86

    By kgkern01,
    • 10 replies
    • 38.5k views

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

    By Alec Kerchner,
    • 0 replies
    • 733 views

  24. 2015 Sierra 6.2 has a new loud tick when warm

    By kojimep,
    • 11 replies
    • 6.2k views

  25. Tri-pot fuel pump problems?

    By mmrbad,
    • 1 reply
    • 740 views
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