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Semi true the military does use 10wt to simplify logistics but the parts are bought to meet the military spec, and Allison would not have honored the warranty on 50000 transmissions if they didn't use a proper transmission fluid for that transmission. These trucks were not bought off a civilian...

Okay Juan the oil that we are talking about is not 10wt engine oil but 10wt hydraulic and transmission oil, different additives I would think, also atf has more friction and is thinner than 10wt correct?

As to the air sound on the intake the trumpet sound is normal when you set the park brake and release the foot petal, but a hissing out of the intake tube is not.

Juan I am going to disagree with you and say stay with the 10wt these transmissions were built to run 10wt by Allison and I have talked about this with many transmission rebuilders and they said stay with the 10wt.