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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. 8 speed suddenly went out. No forward or reverse gears 1 2 3

    By kgkern01,
    • 44 replies
    • 23k views

  2. Need HELP P0203

    By carl mack,
    • 0 replies
    • 1k views

  3. Code for fuel pressure regulator.

    By RyanD77968,
    • 6 replies
    • 16k views

  4. 1 to 2 hard shift + grounds

    By CrawlSlow,
    • 7 replies
    • 1.9k views

  5. Bad AC Delco Spark Plugs?

    By ForestryGuy,
    • 3 replies
    • 2.9k views

  6. Unexplained Cylinder 4 Misfire 1 2

    By dtreid,
    • 15 replies
    • 37.3k views

  7. Successful LT5 TB Upgrade Night/Day

    By Noizyboy,
    • 14 replies
    • 10.8k views

  8. Active Grill Shudders Question/advise

    By Miguel Olea,
    • 13 replies
    • 2.8k views

  9. 5.3L thermostat and coolcircuit operation

    By Larsson,
    • 0 replies
    • 779 views

  10. Installed ADD W1 Oil Catch Can 1 2 3 4 22

    By EXSlider400,
    • 323 replies
    • 106.6k views

  11. Transmission/Torque Converter Issues AGAIN

    By InsuredByBeretta,
    • 9 replies
    • 2.3k views

  12. Tuning for 6L80 Transmission and 5.3 Engine maximum longevity 1 2

    By Thomas Hill,
    • 15 replies
    • 18k views

  13. 2014 Silverado 5.3 #3 cyl dead miss at idle only. 1 2

    By LeBaron,
    • 25 replies
    • 3.9k views

  14. 2018 Silverado 5.3 to 6.2 LT Swap 1 2

    By 03GMCSS2,
    • 15 replies
    • 15.5k views

  15. Error code P0358: “Ignition Coil H Primary/Secondary Circuit Malfunction"

    By 15BlueSilverado,
    • 0 replies
    • 1.4k views

  16. 2016 oil pan rtv question?

    By Rickyace09,
    • 7 replies
    • 8.3k views

  17. 87 octane on 91 tune for 30k km

    By ChuckTaylors27,
    • 2 replies
    • 965 views

  18. Correct PN for Rear Diff Pinion Seal

    By betyouaint,
    • 4 replies
    • 2.3k views

  19. 2014 GMC Sierra 5.3L Squeak on Downshift

    By Reegs941,
    • 2 replies
    • 1.1k views

  20. A story of 7 spark plugs.... 2018 Silverado 6.2L w/ 7600 miles

    By WeberKettleGuy,
    • 4 replies
    • 13.2k views

  21. Oil pump change questions

    By Cbings,
    • 4 replies
    • 3k views

  22. tie rod ends over greasing??

    By ChopZ71,
    • 10 replies
    • 9.7k views

  23. Help! Please ASAP!!! 2019 L83 DOD/AFM Lifter "Placement"

    By MultiMix,
    • 4 replies
    • 5.3k views

  24. Humming upon Acceleration 2014 Sierra

    By Dennis77,
    • 9 replies
    • 11.6k views

  25. 2016 Silverado lower oil pan leak

    By Rickyace09,
    • 1 reply
    • 787 views

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