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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

14 topics in this forum

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

    By Terra Platt,   
    • 10 replies
    • 478 views

  3. Engine light on 2401 miles 1 2 3

    By Jnuehring,
    • 40 replies
    • 1,985 views

  4. 2020 6.6 D-max towing MPG

    By Lfod1836,
    • 6 replies
    • 212 views

  5. 20 Duramax MPG.......how are we doing?

    By Peekaboo Bruizer,
    • 9 replies
    • 458 views

  6. 2020 Allison - oil can filter?

    By pw42,
    • 5 replies
    • 219 views

  7. 10 speed Allison Transmission 1 2 3

    By Double Dkar,
    • 30 replies
    • 2,775 views

  8. Help buying new truck 1 2 3

    By Lfod1836,
    • 39 replies
    • 952 views

  9. Invisible trailer question

    By Michaellallen,   
    • 1 reply
    • 150 views

  10. Exhaust coming into the cab

    By 426yzf,
    • 1 reply
    • 168 views

  11. 2020 L5P First Oil Change 1 2

    By MrGraff,
    • 22 replies
    • 1,524 views

  12. Towing question?

    By mbsfgts,
    • 10 replies
    • 869 views

  13. Please help with a towing question 1 2

    By Pfc1,
    • 15 replies
    • 1,267 views

  14. 2019 Chev 3500HD L5P Shutting Off

    By Pedro DeLeon Jr,
    • 5 replies
    • 554 views

  15. Allison Transmission

    By Teach,
    • 0 replies
    • 434 views


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