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Engines & Drivetrain (V8, Duramax, TurboMax)

Technical discussion for the 6.2L (L87), 5.3L (L84), 3.0L Duramax (LZ0/LM2), and 2.7L TurboMax. Tuning, maintenance, and 8-speed &10-speed transmission tech.

1,140 topics in this forum

  1. Dexron ULV vs Valvoline ULV

    By Atlas,
    • 2 replies
    • 4.2k views

  2. 3.0L Duramax Oil Pan Upgrade

    By Haufski762,
    • 12 replies
    • 4.3k views

  3. Lifters went.

    By Joshfire72,
    • 7 replies
    • 4.4k views

  4. 2025 Sierra 1500 AT4X Oil Leak (LZ0)

    By Otherguy,
    • 1 reply
    • 1.2k views

  5. Transmission RPO Codes for 2023 GMC Sierra 3.0L Duramax 4 wheel drive 10 speed

    By Loadmaster,   
    • 5 replies
    • 3.4k views

  6. 2021 LM2 3.0 Coolant Control Valve

    By d9gdon,
    • 12 replies
    • 45.1k views

  7. Low speed vibration 5.3l /6.2 with 10 speed transmission

    By SSsierra,
    • 4 replies
    • 4.2k views

  8. 6.2 L87 Recall Results 1 2

    By WeGone,
    • 27 replies
    • 4.3k views

  9. 0 W 40 oil upgrade 1 2

    By Mike Duhaime,
    • 26 replies
    • 4.3k views

  10. 2020 8 speed Filter

    By 20CHEVYRIDER,
    • 6 replies
    • 1.3k views

  11. 2024 GMC Sierra 1500 Elevation 2.7L Turbomax Oil Leak at 2000 Miles 1 2

    By Jason Ridge,
    • 20 replies
    • 12.8k views

  12. 2022 3.0 Duramax - Software Problems after TCM Update

    By Redneck Limo,
    • 2 replies
    • 1.5k views

  13. A lot of "soot" black buildup in and around the outside edges of my HDMI exhaust pipes

    By johnnyquick,
    • 8 replies
    • 2.9k views

  14. 8L90 upgrades?

    By AJMBLAZER,   
    • 4 replies
    • 6.9k views

  15. '21 Silverado 8speed Cold Shift issues

    By rgholmes08,
    • 14 replies
    • 23.6k views

  16. 2023 GMC Sierra Valve Body replacement

    By Charles J Precourt and Son,
    • 1 reply
    • 996 views

  17. Lifter Failure Question 1 2 3 4 5

    By NorthernX31,
    • 61 replies
    • 64.5k views

  18. Oil pressure gauge

    By Jus Cruisin,
    • 4 replies
    • 1k views

  19. Preventive part replacement

    By mmattia777,
    • 5 replies
    • 1.5k views

  20. High pressure fuel pump

    By stressed,
    • 0 replies
    • 692 views

  21. 5w30 oil 1 2 3 4 29

    By PunchT37,
    • 422 replies
    • 101.7k views

  22. 2021 Silverado has Valve Body Back Order- Anyone else 1 2 3

    By Jeffdew,
    • 33 replies
    • 20k views

  23. Transmission issues

    By B-C Oconnor-barber,
    • 1 reply
    • 1.3k views

  24. 2020 Sierra 3.0 Duramax bad turbo???

    By TheBigBadWolf,
    • 4 replies
    • 10.2k views

  25. Transmission issues 2022 2.7

    By steelerdude1,
    • 10 replies
    • 20.5k views
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