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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. Steering Assist Reduced after dyno tune

    By Crimson6.2L,
    • 1 reply
    • 1.6k views

  2. transfer case and front/rear diff oil change recommendations 1 2 3

    By GrandChien14,
    • 30 replies
    • 3.5k views

  3. Ticking sound in engine 1 2

    By bulldog77,
    • 16 replies
    • 2k views

  4. MBRP vs Carven catback help 1 2

    By jankymechanic,
    • 21 replies
    • 6.8k views

  5. Wrong spark plug? 1 2

    By Mozzer,
    • 18 replies
    • 8.5k views

  6. Oil filler tube, neck or whatever.

    By SIERRA/T,
    • 10 replies
    • 18.4k views

  7. Exhaust 1 2

    By Spencer Burns,
    • 16 replies
    • 2.3k views

  8. HP Tuners Unlocked TCM 1 2

    By contenderv07,
    • 15 replies
    • 23.7k views

  9. Spark plug part numbers and gap size? 1 2

    By nadrojcote,
    • 23 replies
    • 66.6k views

  10. Possible header tick

    By simonsd0708,
    • 2 replies
    • 626 views

  11. Life expectancy of unused engine oil? 1 2 3 4

    By TXGREEK,
    • 47 replies
    • 6k views

  12. What’s the feeling on Lucas Upper Cylinder Lubricant?

    By Bob2C,
    • 0 replies
    • 1.4k views

  13. K&n

    By Dbh,
    • 1 reply
    • 467 views

  14. Adding E85 sensor to 17 6.2

    By Crimson6.2L,
    • 12 replies
    • 3.4k views

  15. Need quiet muffler for dual set up, 2018 sierra 1500

    By joeb123joeb,
    • 6 replies
    • 1k views

  16. Flowmaster 50 delta flow opinions

    By Graphite Silverado 2018,
    • 0 replies
    • 706 views

  17. Add me to the P0420 club...

    By papageoff,
    • 5 replies
    • 1.1k views

  18. 2015 4.3 to 6.2 swap (l86)/8l90e issues 1 2

    By B M,   
    • 15 replies
    • 12.3k views

  19. Recommended Octane grade 1 2

    By VinceS,
    • 15 replies
    • 3.7k views

  20. Whipple vs. Procharger & Other Poll 1 2 3 4

    By jogutier,
    • 50 replies
    • 36.6k views

  21. black bear tune on a 17 1 2 3

    By speedracer2536,
    • 35 replies
    • 24.6k views

  22. L86 6.2 Intake Cover Removal - Why?

    By Daniel Lucas,
    • 1 reply
    • 2.9k views

  23. Clunk when almost stopped.

    By Donstar,
    • 14 replies
    • 8.8k views

  24. 8 spd full flush and filter change recommendation, pricing, TSB#, 2016 1 2 3

    By DeathByNissan55,   
    • 38 replies
    • 37.5k views

  25. Thoughts on this "Stage 1" before adding Whipple during "Stage 2"

    By ralphsmithiii,
    • 8 replies
    • 2k views
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