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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.

2,728 topics in this forum

  1. 2014 Silverado

    By Dennis Russell,
    • 0 replies
    • 737 views

  2. 2015 6l80 to 2018 6l80 swap

    By Arturo Alva,
    • 3 replies
    • 2.2k views

  3. Long tube headers

    By Jeff England,
    • 5 replies
    • 1.4k views

  4. LT header? 1 2

    By saltgod,
    • 28 replies
    • 13.2k views

  5. Front Differential Swap

    By Justheman80,
    • 5 replies
    • 3.9k views

  6. L86 8-rib conversion (ATI Damper)

    By Superado1618,
    • 0 replies
    • 790 views

  7. 2014 4.3L Ignition timing is -8 to -13 degrees at idle.

    By Mark Duke,
    • 8 replies
    • 7.3k views

  8. 8l90E Guru question.

    By gonzoid,
    • 0 replies
    • 760 views

  9. Reuse rear ubolts?

    By Snowcamo,
    • 6 replies
    • 1.1k views

  10. Rear end bearings fail

    By ace ventura,
    • 2 replies
    • 867 views

  11. 2017 Silverado 1500 5.3L AFM issues.

    By Geist auto service,   
    • 5 replies
    • 34.5k views

  12. Big Cam, Big Gains

    By SeekAndDestroy,
    • 3 replies
    • 2.8k views

  13. 8L90 Torque Converter Upgrade

    By Foary,
    • 2 replies
    • 13.1k views

  14. 2014 Sierra 1500 - Front diff leak

    By Neil G,
    • 8 replies
    • 2.7k views

  15. Front wheel bearings???

    By mikeyk101,
    • 5 replies
    • 1.3k views

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

    By Payton34,
    • 17 replies
    • 31.3k views

  17. Engine swap

    By Dubwatson86,
    • 2 replies
    • 1.4k views

  18. 6L80E thermostatic bypass valve replacement and Bulletin #21-NA-199

    By Andrew18,   
    • 7 replies
    • 75.5k views

  19. Mid-Length Headers

    By rlcole321,
    • 8 replies
    • 3.5k views

  20. AFM Delete - Which kit is preferred?

    By Nickhop,
    • 3 replies
    • 11.2k views

  21. 2015 GMC Sierra 1500 DOD Lifter Replacement

    By mamarinelli,
    • 5 replies
    • 8k views

  22. 100,000 Mile Spark Plugs

    By TheRiver,
    • 3 replies
    • 1.3k views

  23. TRANSMISSION RANGE SWITCH

    By BlkDenali6.2,
    • 0 replies
    • 671 views

  24. 2014 Silverado Transmission/Torque Converter help

    By jwoody28,
    • 4 replies
    • 2.8k views

  25. click, no start

    By josney,
    • 2 replies
    • 821 views
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