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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. Question about V4 mode 1 2 3 4

    By ringbuster,
    • 45 replies
    • 8.5k views

  2. Race fuel smell???

    By jauldusmc,
    • 6 replies
    • 1.1k views

  3. 5.3L Oil Drain Plug & Filter

    By btj_z71,   
    • 13 replies
    • 13.1k views

  4. Borla Sport exhaust swap to Borla Touring

    By Musgo,
    • 8 replies
    • 4.7k views

  5. transmission maintenance

    By Cheekster96,
    • 1 reply
    • 809 views

  6. Flowmaster makes you make a choice

    By Husker_1911,   
    • 4 replies
    • 1.4k views

  7. 2015 Silverado 5.3 Turbo Questions and Help

    By Silverado_Matt_15,   
    • 1 reply
    • 8.9k views

  8. 2017 Silverado Exhaust Systems Recommendation

    By Emusician101,
    • 3 replies
    • 2.4k views

  9. 2014 Silverado Regear for Towing

    By sammiller86,   
    • 10 replies
    • 7.1k views

  10. CRC GDI Valve Cleaner spray 1 2 3

    By FL335i,
    • 34 replies
    • 22.9k views

  11. Louder / Aggressive Sound 2015 Silverado

    By joemeigs8,
    • 5 replies
    • 16.8k views

  12. replacement for corsa sport muffler 1 2

    By johnk45,   
    • 24 replies
    • 7.6k views

  13. Question about diablo i3 vs predator

    By Bammer25,
    • 10 replies
    • 5.1k views

  14. Stalled up or off idle??

    By Gorske,
    • 3 replies
    • 867 views

  15. Vacuum port for Seafoam

    By Jim Schmidt,
    • 1 reply
    • 1.5k views

  16. how much of a over bore will the L83 take

    By J.R.,
    • 4 replies
    • 16.8k views

  17. 2014 GMC Sierra Transmission Issues & Warranty

    By str8304,
    • 2 replies
    • 10.8k views

  18. ProCharger/Black Widow 250 muffler WOT video

    By Gorske,
    • 7 replies
    • 1k views

  19. posi rear end

    By Trigger man,
    • 9 replies
    • 12.9k views

  20. 2015 Rear Gear Swap

    By jackgraves,
    • 2 replies
    • 913 views

  21. Gear Change 9.5" 12 bolt 1 2 3 4 9

    By CAtaylor,
    • 131 replies
    • 65.3k views

  22. OBX and Maximizer Long Tube Headers -- Anyone?

    By nando87,
    • 13 replies
    • 12.6k views

  23. HELP! High oil level

    By 14SierraZ71,   
    • 5 replies
    • 4.2k views

  24. Help identify this noise

    By MugsyMalone,
    • 0 replies
    • 459 views

  25. Did the dealer leave my TCM unlocked??

    By emeryz28,
    • 9 replies
    • 5.4k views

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