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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

164 topics in this forum

  1. Duramax exhaust pipe

    By Walkerman,
    • 1 reply
    • 1.9k views

  3. Dmax Plant Expansion

    By C/K Man,
    • 1 reply
    • 1.7k views

  4. 2020 6.6 D-max towing MPG 1 2 3

    By Lfod1836,
    • 33 replies
    • 25.4k views

  5. Dealer oil change

    By shadow gray 2020 hd,
    • 12 replies
    • 4.3k views

  6. 10 speed Allison Transmission 1 2 3

    By Double Dkar,
    • 41 replies
    • 47.7k views

  7. High RPMs downhill

    By JHarris32,
    • 7 replies
    • 5.4k views

  8. Transmission Fluid Change

    By mark_in_co,
    • 3 replies
    • 6.4k views

  9. 2020+ 3500 HD CCSB Denali Duramax RGAWR?

    By 20151500SLT,
    • 2 replies
    • 1.5k views

  10. Truck showing no trailer connected.

    By PaulEC,
    • 3 replies
    • 3.2k views

  11. Game Changer - Banks PedalMonster

    By u3putt,
    • 11 replies
    • 11.3k views

  12. Fuel Filter - 2021 L5P

    By Laidback,
    • 8 replies
    • 7.5k views

  13. Questions for a Diesel Tuner

    By 2500W/T,
    • 2 replies
    • 1.8k views

  14. Tuners Wanted

    By 2500W/T,
    • 1 reply
    • 1.2k views

  15. Trailer running light fault

    By GotDog,
    • 0 replies
    • 917 views

  16. What did you pay for your 2020 truck 1 2 3

    By Ronnell Roegner,
    • 43 replies
    • 19.4k views

  17. Service Mode

    By ekbruster,
    • 1 reply
    • 2.8k views

  18. 10L1000 Trans Fluid Filter

    By 2500W/T,
    • 2 replies
    • 3.3k views

  19. 2020 2500 vs 3500 hd diesel 1 2

    By Akwagon,
    • 28 replies
    • 11.3k views

  20. looking for engine oil add trick

    By iflypigs,
    • 8 replies
    • 7.2k views

  21. fifth wheel hitch

    By Mardo,
    • 12 replies
    • 5.6k views

  22. Transfer case leak 3274 miles

    By Bones454,
    • 4 replies
    • 2k views

  23. Terrible highway pulling power

    By Trent Gonzalez,
    • 7 replies
    • 4.7k views

  24. Newbie looking for info.

    By Sumrtime,
    • 1 reply
    • 1.4k views

  25. 2021 2500 AT4 payload

    By Mardo,
    • 8 replies
    • 5k views

  26. ibanks 1.8

    By Laidback,
    • 3 replies
    • 1.7k views


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