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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. 87 octane on 91 tune for 30k km

    By ChuckTaylors27,
    • 2 replies
    • 986 views

  2. Correct PN for Rear Diff Pinion Seal

    By betyouaint,
    • 4 replies
    • 2.5k views

  3. 2014 GMC Sierra 5.3L Squeak on Downshift

    By Reegs941,
    • 2 replies
    • 1.1k views

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

    By WeberKettleGuy,
    • 4 replies
    • 13.7k views

  5. Oil pump change questions

    By Cbings,
    • 4 replies
    • 3.1k views

  6. tie rod ends over greasing??

    By ChopZ71,
    • 10 replies
    • 9.8k views

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

    By MultiMix,
    • 4 replies
    • 5.5k views

  8. Humming upon Acceleration 2014 Sierra

    By Dennis77,
    • 9 replies
    • 11.7k views

  9. 2016 Silverado lower oil pan leak

    By Rickyace09,
    • 1 reply
    • 793 views

  10. Rear Differential 2015 Silverado Z71 Binding

    By 2015SSilverado,   
    • 4 replies
    • 3.1k views

  11. Driveline Shudder/Vibe 1 2

    By Spurshot,
    • 24 replies
    • 3.4k views

  12. Fuel Injector Special Warranty

    By magnusdog,
    • 8 replies
    • 35.9k views

  13. What transmission is compatible

    By bluehatch 87,   
    • 4 replies
    • 6.2k views

  14. Oil Pump and Lifter Issues, or something else causing this?

    By KevinRum,
    • 10 replies
    • 13.6k views

  15. Has anyone swapped a LM7 or similar gen in k2xx

    By Exposing FACTZ,
    • 3 replies
    • 975 views

  16. 4 Auto and 4 Hi vibrations after 4" BDS Lift

    By 6.2Creedmoor,
    • 9 replies
    • 6.2k views

  17. Possible Transmission/Torque Converter Failure

    By m980,
    • 10 replies
    • 3.1k views

  18. Recommendation for RCSB cat back on lowered truck? 1 2

    By BigTopGT,
    • 20 replies
    • 2.8k views

  19. Fuel Cell Installed In Truck Bed

    By Darth_Vader,
    • 8 replies
    • 9.9k views

  20. Transmission Temps High When Towing

    By papageoff,
    • 9 replies
    • 1.9k views

  21. Possible torque converter failure?

    By Calvin Novak,
    • 7 replies
    • 2.2k views

  22. Cat delete on 2018 5.3 silverado

    By king_castro_91,
    • 5 replies
    • 8.3k views

  23. Looking at picking up my first GM truck (2018 silverado 1500), looking for things to watch for

    By tube,
    • 2 replies
    • 1k views

  24. Brand new (maybe not new after all) TBV 70⁰ strange temps. 1 2 3

    By mikeyk101,
    • 30 replies
    • 4.7k views

  25. Wiring Harness

    By Ronaldo Ortega,
    • 3 replies
    • 868 views
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