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That will work fine. Allison no longer publishes Dex III or C-4 in their lube recommendation since they came out with the Expensive synthetic :beer:TES-295 fluid, but the transmissions don't know that.

the lube order calls for straight 10Wt Napa can get it. I suppose the multi viscosity will work in a pinch.

The Axles and X-fer case is 80/90, The military used #10wt engine oil, not 15/40. If you go to the Allison Website, they call out TES-295 oil, which is synthetic, and made for that tranny. I couldn't find Dex III mentioned at all on the Allison site. #10 wt oil has very poor operating...