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Harsh shifts is one of the results. I know it because I did the change before and the shifts are much better, especially when cold. PS. Does that Allison repair guy buy you a new transmission, in case his opinion was wrong and changing the fluid wasn't a waste of money after all? I would have...

I didn't see levelox's reply as an insult. It's your right to use whatever you want in your trucks transmission. As it was said before , The Army just uses oil as it is simpler and it is one of the fluids specified by Allison to work in the FMYV transmission. I won't last as long though. which...

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