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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.

2,727 topics in this forum

  1. 1 to 2 hard shift + grounds

    By CrawlSlow,
    • 7 replies
    • 1.9k views

  2. Bad AC Delco Spark Plugs?

    By ForestryGuy,
    • 3 replies
    • 2.8k views

  3. Unexplained Cylinder 4 Misfire 1 2

    By dtreid,
    • 15 replies
    • 36.8k views

  4. Successful LT5 TB Upgrade Night/Day

    By Noizyboy,
    • 14 replies
    • 10.6k views

  5. Active Grill Shudders Question/advise

    By Miguel Olea,
    • 13 replies
    • 2.6k views

  6. 5.3L thermostat and coolcircuit operation

    By Larsson,
    • 0 replies
    • 769 views

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

    By EXSlider400,
    • 323 replies
    • 105.6k views

  8. Transmission/Torque Converter Issues AGAIN

    By InsuredByBeretta,
    • 9 replies
    • 2.2k views

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

    By Thomas Hill,
    • 15 replies
    • 17.7k views

  10. 2014 Silverado 5.3 #3 cyl dead miss at idle only. 1 2

    By LeBaron,
    • 25 replies
    • 3.8k views

  11. 2018 Silverado 5.3 to 6.2 LT Swap 1 2

    By 03GMCSS2,
    • 15 replies
    • 15.2k views

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

    By 15BlueSilverado,
    • 0 replies
    • 1.4k views

  13. 2016 oil pan rtv question?

    By Rickyace09,
    • 7 replies
    • 8k views

  14. 87 octane on 91 tune for 30k km

    By ChuckTaylors27,
    • 2 replies
    • 919 views

  15. Correct PN for Rear Diff Pinion Seal

    By betyouaint,
    • 4 replies
    • 2.1k views

  16. 2014 GMC Sierra 5.3L Squeak on Downshift

    By Reegs941,
    • 2 replies
    • 1.1k views

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

    By WeberKettleGuy,
    • 4 replies
    • 12.5k views

  18. Oil pump change questions

    By Cbings,
    • 4 replies
    • 2.9k views

  19. tie rod ends over greasing??

    By ChopZ71,
    • 10 replies
    • 9.5k views

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

    By MultiMix,
    • 4 replies
    • 5.1k views

  21. Humming upon Acceleration 2014 Sierra

    By Dennis77,
    • 9 replies
    • 11.6k views

  22. 2016 Silverado lower oil pan leak

    By Rickyace09,
    • 1 reply
    • 769 views

  23. Rear Differential 2015 Silverado Z71 Binding

    By 2015SSilverado,   
    • 4 replies
    • 2.9k views

  24. Driveline Shudder/Vibe 1 2

    By Spurshot,
    • 24 replies
    • 3.1k views

  25. Fuel Injector Special Warranty

    By magnusdog,
    • 8 replies
    • 34.5k views

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