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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 Chevrolet Silverado 2500 / 3500 or 2020 GMC Sierra 2500 / 3500

131 topics in this forum

  1. 2020 and up, dpf system recall

    By shadow gray 2020 hd,
    • 1 reply
    • 162 views

  3. Need Deleted L5P Advice 1 2

    By Brozat4,
    • 26 replies
    • 19.6k views

  4. Exhaust Fumes in Cab

    By Skilpot,
    • 14 replies
    • 4.4k views

  5. 220 Amp Alternator Question - 2021 Silverado 2500HD Duramax

    By tortiseshell,
    • 14 replies
    • 942 views

  6. Service DEF System - XX miles until 65 mph 1 2

    By swaptrex14,
    • 29 replies
    • 32.7k views

  7. 3500 SRW vs DRW

    By jeffd,
    • 3 replies
    • 567 views

  8. 2021 Duramax

    By Harold Desautel,
    • 1 reply
    • 1k views

  9. 2020 GMC AT4 Garbage Brakes!

    By SVAT4,
    • 14 replies
    • 8.4k views

  10. Russia sanctions effect DEF URea manufactuering????

    By pokismoki,
    • 8 replies
    • 898 views

  11. sultastic spring shackles

    By anthonybehnken,   
    • 3 replies
    • 1.5k views

  12. Duramax exhaust pipe

    By Walkerman,
    • 1 reply
    • 781 views

  13. Airlift options for DRW?

    By John FX,
    • 3 replies
    • 664 views

  14. Dmax Plant Expansion

    By C/K Man,
    • 1 reply
    • 964 views

  15. 2020 6.6 D-max towing MPG 1 2 3

    By Lfod1836,
    • 33 replies
    • 18.9k views

  16. Dealer oil change

    By shadow gray 2020 hd,
    • 12 replies
    • 1.8k views

  17. 10 speed Allison Transmission 1 2 3

    By Double Dkar,
    • 41 replies
    • 38.3k views

  18. High RPMs downhill

    By JHarris32,
    • 7 replies
    • 3.3k views

  19. Transmission Fluid Change

    By mark_in_co,
    • 3 replies
    • 1.7k views

  20. 2020+ 3500 HD CCSB Denali Duramax RGAWR?

    By 20151500SLT,
    • 2 replies
    • 964 views

  21. Truck showing no trailer connected.

    By PaulEC,
    • 3 replies
    • 1.1k views

  22. Game Changer - Banks PedalMonster

    By u3putt,
    • 11 replies
    • 7.4k views

  23. 2020 2500HD AT4 - 17K miles - Allison leaked and -REBUILD- 1500m from home

    By Kaamacat,
    • 8 replies
    • 1.8k views

  24. Fuel Filter - 2021 L5P

    By Laidback,
    • 8 replies
    • 5k views

  25. Questions for a Diesel Tuner

    By 2500W/T,
    • 2 replies
    • 1.3k views

  26. Tuners Wanted

    By 2500W/T,
    • 1 reply
    • 835 views


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