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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. 2014 Sierra 1500 - Front diff leak

    By Neil G,
    • 8 replies
    • 2.9k views

  2. Front wheel bearings???

    By mikeyk101,
    • 5 replies
    • 1.4k views

  3. Just had all afm lifter replaced and failed again 3 days later less than 100 miles 1 2

    By Payton34,
    • 17 replies
    • 32.9k views

  4. Engine swap

    By Dubwatson86,
    • 2 replies
    • 1.5k views

  5. 6L80E thermostatic bypass valve replacement and Bulletin #21-NA-199

    By Andrew18,   
    • 7 replies
    • 80.3k views

  6. Mid-Length Headers

    By rlcole321,
    • 8 replies
    • 3.7k views

  7. AFM Delete - Which kit is preferred?

    By Nickhop,
    • 3 replies
    • 11.8k views

  8. 2015 GMC Sierra 1500 DOD Lifter Replacement

    By mamarinelli,
    • 5 replies
    • 8.4k views

  9. 100,000 Mile Spark Plugs

    By TheRiver,
    • 3 replies
    • 1.3k views

  10. TRANSMISSION RANGE SWITCH

    By BlkDenali6.2,
    • 0 replies
    • 697 views

  11. 2014 Silverado Transmission/Torque Converter help

    By jwoody28,
    • 4 replies
    • 2.9k views

  12. click, no start

    By josney,
    • 2 replies
    • 857 views

  13. 2016 Silverado LT - is my transmission going? Maybe my TC?

    By InsuredByBeretta,
    • 5 replies
    • 1.8k views

  14. Service 4wd message 2017 1500 Silverado

    By Cd264,
    • 2 replies
    • 906 views

  15. Statistically, How Prevalent Are Transmission, AFM, and Lifter Issues?

    By Muley,
    • 7 replies
    • 9.3k views

  16. Headers: long tube vs shorty's

    By hordy240,
    • 2 replies
    • 3.9k views

  17. Salvaging a L86 6.2L V8

    By CadillacLuke24,
    • 14 replies
    • 11.1k views

  18. 5.3L normal idle rpm 1 2

    By roweac,
    • 23 replies
    • 103.8k views

  19. Transmission Thermostat Delete Pros vs. Cons 1 2 3 4 14

    By Eddie 70,
    • 202 replies
    • 170.5k views

  20. L83 DoD Delete with L86 cam questions

    By UrbanRage,
    • 4 replies
    • 8.4k views

  21. 2014 GMC Sierra 1500 5.3 with 220k miles

    By teddyb1776,
    • 14 replies
    • 11.6k views

  22. 2015 Silverado - Burning Oil (Active Fuel Management)

    By Smith035,
    • 7 replies
    • 15.8k views

  23. 2018 gmc sierra with e assit

    By kinser,
    • 2 replies
    • 1.5k views

  24. Lv3 and afm

    By WranglerMike,
    • 2 replies
    • 1.9k views

  25. Trans cooler

    By BS2017,
    • 3 replies
    • 957 views

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