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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.

2,739 topics in this forum

  1. 4 piston Brake Upgrade 1 2

    By Razr20,
    • 15 replies
    • 11.2k views

  2. 2018 Randomly Stalls and No Start - No Codes!

    By Kubs,
    • 14 replies
    • 2.1k views

  3. Seeing 2 MAF readouts, wildly far apart

    By DillbroSwaggins,
    • 1 reply
    • 275 views

  4. 2015 sierra 4x4 6l80 problems

    By dhandyman,
    • 2 replies
    • 418 views

  5. Sporadic clicking sound I can't ID

    By No Tyme,
    • 7 replies
    • 675 views

  6. First UOA on my 18 Sierra

    By ForestryGuy,
    • 2 replies
    • 369 views

  7. Seafoam in oil

    By countryguy1717,
    • 10 replies
    • 695 views

  8. Transmission fluid change 1 2

    By M1ck3y,
    • 23 replies
    • 1.8k views

  9. Edge Insight CTS3 not showing alcohol percentage

    By Crimson6.2L,
    • 4 replies
    • 538 views

  10. 6L80E additives

    By LoganBryant58,
    • 1 reply
    • 524 views

  11. Cab swap

    By aktr,
    • 0 replies
    • 144 views

  12. 4.3 vs 5.3 1 2 3 4 9

    By Manny254,
    • 125 replies
    • 94.9k views

  13. Check my thinking here.

    By Jay Ratliff,
    • 4 replies
    • 861 views

  14. NGK Ruthenium vs AC Delco Iridium spark plugs for 5.3? 1 2 3

    By greenoliver1,
    • 34 replies
    • 46.8k views

  15. Change atf or not? 1 2

    By countryguy1717,
    • 22 replies
    • 2.2k views

  16. Procharger D1SC to F1A

    By BlkBety,
    • 0 replies
    • 309 views

  17. Are these transmission parts? (8L90)

    By LordBusiness,
    • 1 reply
    • 625 views

  18. 5.3 VLOM Filter

    By bayouguy71,
    • 7 replies
    • 1.6k views

  19. Valvoline Restore & Protect

    By Spurshot,
    • 1 reply
    • 2.5k views

  20. Gear Swap

    By M1ck3y,
    • 9 replies
    • 745 views

  21. Dorman exhaust manifold (674-495 and 674-496) reviews

    By AFournier,
    • 0 replies
    • 530 views

  22. Preventative maintenance

    By countryguy1717,
    • 4 replies
    • 701 views
    • rav3
    • rav3

  23. How Long Do I Have Left?

    By midnightsilvy,   
    • 3 replies
    • 823 views

  24. BTR 220

    By M1ck3y,
    • 7 replies
    • 1.1k views

  25. AFM AC Delco / GM lifters on ebay

    By rdk1ll,
    • 2 replies
    • 380 views
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