Are the military TH400 gears the same as the civilian TH400 gears? I picked up a TH400/208 out of an 86 1 1/4 ton CUCV with less than 35,000 miles on it. I was told that with the 4:56 gears and whatever tire size they come with, that they were good for only about 65mph. It doesn't seem right, makes me think that the gears in the tranny are different. Anyone know? Thanks!