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6.6L Duramax Diesel & Allison Powertrain (L5P/MGM)

Technical powertrain discussion specifically for the 2020+ L5P Duramax Diesel Engine and 10-Speed Allison Transmission combination on the 2020 through 2024+ Chevrolet Silverado 2500 / 3500 or 2020 GMC Sierra 2500 / 3500

147 topics in this forum

  1. fifth wheel hitch

    By Mardo,
    • 12 replies
    • 5k views

  3. Transfer case leak 3274 miles

    By Bones454,
    • 4 replies
    • 1.6k views

  4. Terrible highway pulling power

    By Trent Gonzalez,
    • 7 replies
    • 4.2k views

  5. Newbie looking for info.

    By Sumrtime,
    • 1 reply
    • 1.3k views

  6. 2021 2500 AT4 payload

    By Mardo,
    • 8 replies
    • 4.4k views

  7. ibanks 1.8

    By Laidback,
    • 3 replies
    • 1.6k views

  8. OEM Steel Rim Size

    By 2500W/T,
    • 3 replies
    • 693 views

  9. Oem 5th wheel puck system

    By Eric Griem,
    • 2 replies
    • 2.2k views

  10. 35'S ON 2020 2500

    By scoott,
    • 2 replies
    • 2.1k views

  11. Killing a Duramax

    By 2500W/T,
    • 14 replies
    • 5.1k views

  12. 3 inch cognito lift

    By ND763,
    • 2 replies
    • 2.7k views

  13. Transmission

    By Mat gruber,
    • 2 replies
    • 2.2k views

  14. Garage Door Opener - No Power

    By 2506S,
    • 0 replies
    • 738 views

  15. Free DEF from Dealer

    By CMillSilverado,
    • 2 replies
    • 2.4k views

  16. Emissions System Error

    By H.B. Shannon,
    • 4 replies
    • 29.2k views

  17. Hot plastic smell

    By BLV,
    • 3 replies
    • 3.4k views

  18. Tires rotation and tpms issues

    By Newduramaxh*ar,
    • 1 reply
    • 1.3k views

  19. Problem with intel beam not working

    By BenJG,
    • 9 replies
    • 1.6k views

  20. Exhaust brake or lack there of... need others opinion on this?

    By firedab,
    • 13 replies
    • 12.9k views

  21. 2021 DMAX - cold temp issues?

    By ArrowsmithPML,
    • 13 replies
    • 4.7k views

  22. Oil

    By mostcorey95,
    • 3 replies
    • 3.2k views

  23. 2021 DMAX - cold temp issues? 1 2

    By ArrowsmithPML,
    • 16 replies
    • 7.7k views

  24. Regen?

    By Njmurvin,
    • 11 replies
    • 15.2k views

  25. 2020 Duramax Cold start tick

    By combat1500,
    • 1 reply
    • 1.7k views

  26. Allison transmission fluid

    By Bones454,
    • 3 replies
    • 7.2k views


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