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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

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  1. Silverado 2500HD Issue

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  2. Auto Grade Brake 1 2

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  3. Winter fuel for L5P

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  4. Engine operating temp

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  5. Air bags

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  6. High Idle

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  7. Break in period 1 2

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  8. 2021 Diesel break in 1 2 3

    • 36 replies
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    • 1,042 views


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