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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

88 topics in this forum

  1. Game Changer - Banks PedalMonster

    By u3putt,
    • 0 replies
    • 213 views

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

    By Ronnell Roegner,
    • 24 replies
    • 5,146 views

  4. Silverado 2500HD Issue

    By TFern,
    • 11 replies
    • 1,110 views

  5. Auto Grade Brake 1 2

    By JRSPerf.,
    • 18 replies
    • 1,451 views

  6. Winter fuel for L5P

    By COB II,
    • 3 replies
    • 582 views

  7. Engine operating temp

    By Jfg1300,
    • 6 replies
    • 524 views

  8. Air bags

    By inquenciocha,
    • 3 replies
    • 382 views

  9. Fuel filter change with push-button start

    By Penndel Zeke,
    • 5 replies
    • 715 views

  10. 2020 6.6 D-max towing MPG 1 2

    By Lfod1836,
    • 27 replies
    • 6,876 views

  11. Retractable Tonneau - who has used them in snowy climates?

    By SpeedyD,
    • 2 replies
    • 337 views

  12. High Idle

    By gSwift,
    • 12 replies
    • 3,227 views

  13. Dual battery/alternator configuration?

    By Hank B,
    • 2 replies
    • 388 views

  14. Extended parking idle power off

    By CoalRoller,
    • 2 replies
    • 799 views

  15. 2020 Silverado 2500 DEF usage 1 2 3 4

    By gjohnston7,
    • 59 replies
    • 11,889 views

  16. Leaking Diesel Fuel when topping off the tank

    By Rguerra,
    • 9 replies
    • 657 views

  17. Where do I add trans fluid in 2020 2500 hd

    By Terra Platt,   
    • 14 replies
    • 5,935 views

  18. Break in period 1 2

    By Foldbak,
    • 15 replies
    • 1,535 views

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

    By firedab,
    • 12 replies
    • 2,817 views

  20. sultastic spring shackles

    By anthonybehnken,   
    • 1 reply
    • 404 views

  21. 2020 GMC 3500 SINGLE AXLE AT4 CREW 1 2

    By jojo ma,   
    • 15 replies
    • 2,989 views

  22. 2020 GMC 3500 Denali

    By milosusa,   
    • 2 replies
    • 581 views

  23. Aftermarket exhaust/intake Options 1 2 3

    By Skididdy,
    • 31 replies
    • 3,757 views

  24. 2021 Diesel break in 1 2 3

    By Bayou Cajun,
    • 36 replies
    • 3,034 views

  25. High RPMs downhill

    By JHarris32,
    • 2 replies
    • 823 views

  26. Service DEF System - XX miles until 65 mph

    By swaptrex14,
    • 9 replies
    • 1,042 views


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