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Did a little digging. The only Oshkosh crash truck made in 1974 is the P4. It had the engine in the back, with the transmission pointing forward. So the front axle disconnect, if it has one, will be on the wrong side of the transfer case if you put the engine in the usual spot on your build.

Welcome. That was not used in any other military trucks that I am aware of. I would guess it is a single ratio 1:1, based on the "thinness" of the box (verify by turning yokes). Power would be applied to the upper drive yoke, and then would go through the "drop box" gears to the lower shaft...