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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. Rough Idle, Misfire, Help Diagnosing Codes

    By FishinDVM,
    • 6 replies
    • 13.7k views

  2. G80 3.21/3.41 gear break

    By cr250Silverado,
    • 7 replies
    • 1.5k views

  3. Too much exhaust drone

    By Cash214,   
    • 5 replies
    • 9.1k views

  4. Blew 6.2, gm denying warranty 1 2 3 4 6

    By hectik,
    • 78 replies
    • 11.3k views

  5. Muffler swap on 6.2l 1 2

    By mjdxtreme,
    • 17 replies
    • 11.1k views

  6. GMC/Borla vs Borla Cat Back 1 2 3

    By Denaliboz,
    • 42 replies
    • 18.9k views

  7. Hello from France / Need help on my 2018 DENALI 1 2

    By lolpops,
    • 21 replies
    • 2k views

  8. Speed Engineering True Dual Exhaust

    By Bohanan23,
    • 13 replies
    • 16.9k views

  9. Dipstik Tube on 2018 1500

    By CDNSS,
    • 4 replies
    • 4.6k views

  10. Transmission Service Questions 1 2 3 4

    By thatryan,   
    • 48 replies
    • 6.8k views

  11. 2014-17 Silverado/Sierra Headers 1 2

    By Gorske,
    • 22 replies
    • 20k views

  12. 2017 6 speed trans fluid change

    By mmrbad,   
    • 12 replies
    • 54.6k views

  13. Transmission gets hot under load? Mainly in mountain driving...?

    By Cjmooch,
    • 7 replies
    • 858 views

  14. P0420 Code - 140,000 miles - 2016 Silverado 5.3

    By fondupot,
    • 11 replies
    • 17k views

  15. Cooling Mods for Towing 1 2

    By mitchely03,
    • 16 replies
    • 8.5k views

  16. Catalytic Converter/Engine Light issues - 14' Sierra 1500

    By huntster21,
    • 1 reply
    • 12.6k views

  17. Which UCA’s would you recommend for a leveled or lifted truck and why?? 1 2 3

    By TXGREEK,
    • 31 replies
    • 15.6k views

  18. Oil catch can recommendations 1 2

    By SARNCAN,
    • 19 replies
    • 24k views

  19. Taking truck to dealer Monday 1 2

    By sam hain,
    • 24 replies
    • 2.1k views

  20. 14-18 supercharger gains? 1 2 3 4

    By BoilerUP,
    • 58 replies
    • 33.9k views

  21. SOLD OUT Range Device on sale $129.99.

    By Mileguru,
    • 6 replies
    • 765 views

  22. 2015 Silverado 6.2 lifter failure 1 2

    By Tyler2295,
    • 21 replies
    • 2.3k views

  23. My Intake Mod 1 2 3 4 7

    By Spurshot,
    • 102 replies
    • 41k views

  24. Your States Lifted Truck Laws

    By TXGREEK,
    • 8 replies
    • 1k views

  25. Transmission pan leak with TSP long tube headers and catted y

    By Cash214,   
    • 7 replies
    • 5.1k views
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