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  1. Allison OEM
    Have a 2015 Silverado 2500 HD (LML) with an 6.6 Duramax & Allison tranny with 80K on the clock. Recently changed all fluid in the tranny (2 full drain and refill (4 gals. 668) with internal filter change). What I immediately noticed after completing and test driving was that the truck slowed...
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