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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. Anyone driving at higher elevations?

    By BKK,
    • 7 replies
    • 1.7k views

  2. 2015 Denali Differentials and Transfer Case Oil Changes - pics

    By SuperOldSchool,   
    • 1 reply
    • 1.3k views

  3. Another trans bites the dust

    By KONGon22s,   
    • 7 replies
    • 4k views

  4. GM Borla Making Strange Noise 1 2

    By ShamrockShooter,
    • 25 replies
    • 8.1k views

  5. Question on AFM collapsed lifter failure 1 2 3

    By Doublebase,   
    • 41 replies
    • 57k views

  6. 2016 Silverado Transmission Failure 1 2

    By 69hdflh,
    • 17 replies
    • 14.1k views

  7. 2018 Silverado loss of power with exhaust??

    By Christian Olguin,
    • 12 replies
    • 5.1k views

  8. Strange exhaust sound

    By Rodger Baer,
    • 4 replies
    • 1.1k views

  9. 2017 GMC Sierra Denali transmission & drivers seat issues. Help with warranty

    By mattarmstr,
    • 0 replies
    • 1k views

  10. Engine swap

    By Truckguy567,
    • 1 reply
    • 1k views

  11. 2014 Silverado 1500 2wd U joint size

    By Todd1982,
    • 3 replies
    • 6.2k views

  12. P0740 and High Trans Temp

    By Jonathan Annear,
    • 8 replies
    • 1.3k views

  13. Throttle body upgrade? 1 2

    By rae185,
    • 20 replies
    • 28k views

  14. Intake valve build up - Pics Inside 1 2 3 4

    By JLaw297,
    • 57 replies
    • 10.8k views

  15. Speed Engineering Headers Review

    By VdellaV,   
    • 2 replies
    • 22k views

  16. 2019 Chevy silverado

    By Deadmandriller,
    • 4 replies
    • 788 views

  17. Oil change intervals 1 2 3 4 11

    By MarcuM,
    • 156 replies
    • 36k views

  18. Rear Axle size

    By abnexus,
    • 1 reply
    • 16.7k views

  19. Shudder: Root cause (1) at higher mileage

    By Zack Coles,   
    • 2 replies
    • 2.3k views

  20. Camshaft Failure

    By SeekAndDestroy,
    • 2 replies
    • 6.4k views

  21. Flapper Removed Clip

    By Byrds8,
    • 9 replies
    • 1.4k views

  22. Corsa PowerCore Filter

    By RickRock,
    • 3 replies
    • 698 views

  23. 2018 Silverado E assist.... tuned by BBP

    By Christian Olguin,
    • 2 replies
    • 4.7k views

  24. Routine maintenance

    By meirikm,
    • 9 replies
    • 1.7k views

  25. Power folding mirrors and reverse tilt at the same time

    By Clarkem1,
    • 3 replies
    • 917 views
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