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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. Letter from GM on 2014 and up Sierra Vacuum pump failures 1 2

    By Ed S,   
    • 23 replies
    • 22.9k views

  2. AFM delete kit

    By dna9656,
    • 3 replies
    • 886 views

  3. Is converting to manual possible?

    By Joanna,
    • 14 replies
    • 11.6k views

  4. Mechanical DOD delete without the ECM DOD delete

    By joneich,
    • 5 replies
    • 1.3k views

  5. Vacuum leak?

    By Buddy B,
    • 1 reply
    • 539 views

  6. 2018 silverado humming/whistle on hard acceleration

    By jonny8126,
    • 0 replies
    • 365 views

  7. Vacuum leak brake booster

    By Buddy B,
    • 1 reply
    • 487 views

  8. 2015 Silverado 1500 Screech Sound

    By 2004crewcab,
    • 2 replies
    • 741 views

  9. Dealership, Amsoil or Mobil 1 Oil change

    By UrbanRage,
    • 4 replies
    • 1.1k views

  10. 6L80 What to do?

    By nomadw8,
    • 11 replies
    • 3.1k views

  11. Thinking of changing oil weight to 5W30 after GM's recent recall 1 2

    By rav3,
    • 18 replies
    • 4.3k views

  12. 2015 1500 5.3 6L80 Swap to 8L90 1 2

    By MrRosado,
    • 21 replies
    • 55k views

  13. Need longer o2 harness for turbo L83

    By NcTong01,
    • 1 reply
    • 568 views

  14. 6L80 TC and shift kit upgrade

    By Anthonyvee90,
    • 2 replies
    • 790 views

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

    By Gavin Faulkner,
    • 8 replies
    • 11k views

  16. 2015 6.2L lifter failure at 107K miles. Fix or replace engine?

    By Thatdude,
    • 2 replies
    • 1.2k views

  17. Spark plug oil on threads

    By PIC_3G3,
    • 6 replies
    • 2.9k views

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

    By NC Chevy Owner,
    • 30 replies
    • 14.7k views

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

    By holeshotgmc,
    • 0 replies
    • 359 views

  20. AWD

    By Citykid,
    • 6 replies
    • 1.1k views

  21. Parts Please

    By What the Truck,
    • 4 replies
    • 774 views

  22. How to Tune 6L80 Silverado transmission

    By rav3,
    • 12 replies
    • 3.4k views

  23. 2016 Sierra RCSB Help 1 2

    By Anthonyvee90,
    • 15 replies
    • 1.5k views

  24. Underdrive pulley

    By timber74wolf,
    • 2 replies
    • 750 views

  25. Steering issues

    By dirtdriver11,
    • 2 replies
    • 634 views
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