Funny. You give us a vauge "oh, I'm getting this thing, I don't really even know what it is" story but you intend to swap the axles under your rig. But, you want us to give you some specific specs on them first.
That's kinda like walking into a room blindfolded and humping whatever you run into first. If that's your thing, great. Personally I figure that one should look into what they're about to do ahead of time.
Anyways, it's probably a regular international truck. Something I know little about. If it's a 3/4 ton it probably has a LP D44 up front, and a D60 in the rear. They'll be 67" wide most likely. I doubt there's any lockers factory, maybe a Dana trac-lok or two. Although, no-spins used to show up in the darndest of places. Gearing will either be deep or shallow, depending on the exact year and options. Just 'cause it's military doesn't mean it isn't crap.
Oh Teal... Scouts are 58" WMS-WMS if my memory serves me.