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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.

2,727 topics in this forum

  1. K&n

    By Dbh,
    • 1 reply
    • 450 views

  2. Adding E85 sensor to 17 6.2

    By Crimson6.2L,
    • 12 replies
    • 3.3k views

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

    By joeb123joeb,
    • 6 replies
    • 1k views

  4. Flowmaster 50 delta flow opinions

    By Graphite Silverado 2018,
    • 0 replies
    • 696 views

  5. Add me to the P0420 club...

    By papageoff,
    • 5 replies
    • 1.1k views

  6. 2015 4.3 to 6.2 swap (l86)/8l90e issues 1 2

    By B M,   
    • 15 replies
    • 12.2k views

  7. Recommended Octane grade 1 2

    By VinceS,
    • 15 replies
    • 3.6k views

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

    By jogutier,
    • 50 replies
    • 36.2k views

  9. black bear tune on a 17 1 2 3

    By speedracer2536,
    • 35 replies
    • 24.6k views

  10. L86 6.2 Intake Cover Removal - Why?

    By Daniel Lucas,
    • 1 reply
    • 2.8k views

  11. Clunk when almost stopped.

    By Donstar,
    • 14 replies
    • 8.2k views

  12. 8 spd full flush and filter change recommendation, pricing, TSB#, 2016 1 2 3

    By DeathByNissan55,   
    • 38 replies
    • 36.8k views

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

    By ralphsmithiii,
    • 8 replies
    • 1.9k views

  14. Cab and chassis dual fuel tank

    By Ericoli931,
    • 5 replies
    • 16.3k views

  15. 6 Speed vs 8 Speed Reliability 1 2 3

    By SilveradoCustom,
    • 34 replies
    • 105k views

  16. 2016 bds steering stabilzer bracket install

    By Rich Ryan,
    • 1 reply
    • 454 views

  17. Intake Valves Cleaning Procedure

    By SARNCAN,
    • 10 replies
    • 18k views

  18. Exhaust flapper valve on 2019+

    By SquireSCA,
    • 1 reply
    • 497 views

  19. 180 Thermostat Results (With Towing Data) 1 2 3 4 7

    By Jon A,
    • 97 replies
    • 49.4k views

  20. Looking for vss and or speedometer wire for speed

    By Eric Grenier,
    • 5 replies
    • 517 views

  21. Side exit exhaust pics wanted

    By mitchely03,
    • 12 replies
    • 9.2k views

  22. Gas station selling 93 but not 93 1 2

    By truckguy82,
    • 19 replies
    • 1.6k views

  23. Headers/cats question 1 2

    By Jwal23,
    • 23 replies
    • 9.2k views

  24. traction bars , stealthiest looking

    By flyingfool,
    • 12 replies
    • 6.4k views

  25. Difference between GM's performance CAI's for the 2019 6.2L- 2 PN's now 1 2

    By SierraStorm21,
    • 21 replies
    • 9.4k views
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