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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.

2,730 topics in this forum

  1. What Diff 2019 1500 LD RPO G80 with 3.43 gears?

    By JOEYODR,
    • 5 replies
    • 2.7k views

  2. GMC

    By DeeJay2014,
    • 1 reply
    • 805 views

  3. 2014 Silverado

    By Dennis Russell,
    • 0 replies
    • 741 views

  4. 2015 6l80 to 2018 6l80 swap

    By Arturo Alva,
    • 3 replies
    • 2.2k views

  5. Long tube headers

    By Jeff England,
    • 5 replies
    • 1.4k views

  6. LT header? 1 2

    By saltgod,
    • 28 replies
    • 13.4k views

  7. Front Differential Swap

    By Justheman80,
    • 5 replies
    • 4k views

  8. L86 8-rib conversion (ATI Damper)

    By Superado1618,
    • 0 replies
    • 808 views

  9. 2014 4.3L Ignition timing is -8 to -13 degrees at idle.

    By Mark Duke,
    • 8 replies
    • 7.6k views

  10. 8l90E Guru question.

    By gonzoid,
    • 0 replies
    • 765 views

  11. Reuse rear ubolts?

    By Snowcamo,
    • 6 replies
    • 1.1k views

  12. Rear end bearings fail

    By ace ventura,
    • 2 replies
    • 880 views

  13. 2017 Silverado 1500 5.3L AFM issues.

    By Geist auto service,   
    • 5 replies
    • 35.4k views

  14. Big Cam, Big Gains

    By SeekAndDestroy,
    • 3 replies
    • 2.9k views

  15. 8L90 Torque Converter Upgrade

    By Foary,
    • 2 replies
    • 13.2k views

  16. 2014 Sierra 1500 - Front diff leak

    By Neil G,
    • 8 replies
    • 2.7k views

  17. Front wheel bearings???

    By mikeyk101,
    • 5 replies
    • 1.3k views

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

    By Payton34,
    • 17 replies
    • 31.9k views

  19. Engine swap

    By Dubwatson86,
    • 2 replies
    • 1.4k views

  20. 6L80E thermostatic bypass valve replacement and Bulletin #21-NA-199

    By Andrew18,   
    • 7 replies
    • 77.1k views

  21. Mid-Length Headers

    By rlcole321,
    • 8 replies
    • 3.6k views

  22. AFM Delete - Which kit is preferred?

    By Nickhop,
    • 3 replies
    • 11.4k views

  23. 2015 GMC Sierra 1500 DOD Lifter Replacement

    By mamarinelli,
    • 5 replies
    • 8.1k views

  24. 100,000 Mile Spark Plugs

    By TheRiver,
    • 3 replies
    • 1.3k views

  25. TRANSMISSION RANGE SWITCH

    By BlkDenali6.2,
    • 0 replies
    • 679 views
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