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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. Wiring Harness

    By Ronaldo Ortega,
    • 3 replies
    • 874 views

  2. Are these Genuine GM Oxygen Sensors?

    By Big_Eight,
    • 3 replies
    • 2.2k views

  3. 15 Silverado Front and Rear diff fluid

    By Kyle77,
    • 4 replies
    • 1.5k views

  4. 4wheel High Binding?

    By jsumner83,
    • 2 replies
    • 1.7k views

  5. Gauging interest in complete 8 rib conversion for ecotec3 l86 l83 engi 1 2 3

    By Denali62,
    • 38 replies
    • 12.1k views

  6. RCSB 2wd Driveshafts

    By TwoPlyLife,
    • 5 replies
    • 1.2k views

  7. Strong fuel smell in cab and from engine

    By Steveinsc,   
    • 10 replies
    • 12.4k views

  8. Average MPH

    By TheRiver,
    • 0 replies
    • 608 views

  9. ATF/DOD programmers…

    By Chris krum,
    • 1 reply
    • 1k views

  10. Fuel tank problems on my 2015 Chevy 3500 HD Cab Chassis 6.0

    By Doc61,
    • 0 replies
    • 396 views

  11. Updated Thermal Bypass Valve Installed, still reaches 195 F 1 2

    By gmm43,
    • 15 replies
    • 16.9k views

  12. Front Axle Fill

    By TTA1326,
    • 1 reply
    • 791 views

  13. Amsoil Transmission fluid type for flush?

    By Rickyace09,
    • 4 replies
    • 3.7k views

  14. Oil Catch Can - Surprised By Results 1 2

    By BlaineBug,
    • 19 replies
    • 2.7k views

  15. 5.3 & 6.2 Lifter Failures Compilation Thread

    By BlaineBug,
    • 4 replies
    • 2.7k views

  16. (RE: AFM) Time it is in either configuration?

    By Ubiquity,
    • 2 replies
    • 803 views

  17. Headers and Exhaust

    By EvanUTK,
    • 0 replies
    • 3.8k views

  18. 4.3 engine replacement

    By Hch10111989,
    • 4 replies
    • 2.4k views

  19. 2018 Chevy Silverado rear end clunk

    By 18ltz19,
    • 10 replies
    • 19.2k views
    • AG
    • AG

  20. Codes P0 420 and P0 430

    By dna9656,
    • 3 replies
    • 1k views

  21. 6.2 L86 cleaning throttle body

    By SuperOldSchool,
    • 10 replies
    • 15k views

  22. *4.3 engine replacement*

    By Robert9473,   
    • 4 replies
    • 8.4k views

  23. Timing Cover Seal

    By TheRiver,
    • 2 replies
    • 783 views

  24. 2014 Sierra grinding

    By ABar13,
    • 1 reply
    • 608 views

  25. GM Transmissions 1 2

    By dna9656,
    • 18 replies
    • 3.3k views

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