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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. Need longer o2 harness for turbo L83

    By NcTong01,
    • 1 reply
    • 590 views

  2. 6L80 TC and shift kit upgrade

    By Anthonyvee90,
    • 2 replies
    • 850 views

  3. Swapping an L86(6.2) into a 5.3 (L83)

    By Gavin Faulkner,
    • 8 replies
    • 11.9k views

  4. 2015 6.2L lifter failure at 107K miles. Fix or replace engine?

    By Thatdude,
    • 2 replies
    • 1.3k views

  5. Spark plug oil on threads

    By PIC_3G3,
    • 6 replies
    • 3.6k views

  6. Engine Failure - only 76,000 miles 1 2 3

    By NC Chevy Owner,
    • 30 replies
    • 15.3k views

  7. K&N 57-3103 intake kit fits 2014-2016

    By holeshotgmc,
    • 0 replies
    • 375 views

  8. AWD

    By Citykid,
    • 6 replies
    • 1.2k views

  9. Parts Please

    By What the Truck,
    • 4 replies
    • 811 views

  10. 2016 Sierra RCSB Help 1 2

    By Anthonyvee90,
    • 15 replies
    • 1.7k views

  11. Underdrive pulley

    By timber74wolf,
    • 2 replies
    • 816 views

  12. Steering issues

    By dirtdriver11,
    • 2 replies
    • 663 views

  13. Upgrading - OEM suspension options for 2015-2020 full-size SUV lineup?

    By BlaineBug,
    • 1 reply
    • 1.2k views

  14. Operating temp

    By Citykid,
    • 2 replies
    • 767 views

  15. It's my turn... (Transmission failure) 1 2

    By papageoff,
    • 15 replies
    • 2.9k views

  16. Seeking E85 Clarity for 6.2 L86

    By SkiDooNick700,
    • 11 replies
    • 4.3k views

  17. 2019 Chassis Swap with 2015 1 2

    By Jeff1978,
    • 22 replies
    • 3k views

  18. GM loses class action lawsuit on AFM/DOD or just a rumor ? 1 2

    By Beer Belly,
    • 18 replies
    • 23k views

  19. Intake / TB Swap and Walnut Blasting 2016 L83

    By Congtoid,
    • 0 replies
    • 780 views

  20. 6L80 Thermal Bypass Doesn't match videos for 'pill flip' or Shift Technology modification 1 2

    By Brian Maxwell,
    • 17 replies
    • 3.5k views

  21. Po422 and suspect weak fuel pump. 2017 chevy Silverado 5.3v8

    By Dallas Fisk,
    • 3 replies
    • 2.7k views

  22. Struggling torquing cylinder head down

    By brian.yi15,
    • 1 reply
    • 815 views

  23. 2016 5.3 Silverado Carven R series- Need advice / opinions

    By SMID333,
    • 2 replies
    • 1.2k views

  24. Looking for an old 6L80 transmission cooler bypass valve with quick connect fittings.

    By LilRedDave,
    • 0 replies
    • 538 views

  25. 2017 L83 6L80e Texas Speed Swap AFM Delete?

    By Hexa Fox,
    • 10 replies
    • 8.3k views
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