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    Synthetic vs. Conventional> What fluids do you guys use?

    Allison Trans - Pennzoil Dex III with No-Mo Friction additive Engine - Mobil 1 15W-40 with No-Mo Friction additive Front and Rear Differentials - Valvoline Syn 75W-90 with No-Mo Friction additive I have not changed the transfercase yet because I was not sure what was the best thing to use...