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If you compare the TM pic to the actual, you can see cover #14 at the top of the 2nd pic and Plug 32 at the bottom. Based on that the outputs look fine to me. Also, you hear of people wanting to put 939 axles into their 809 trucks for air brakes. If the outputs were flipped that wouldn't...

Calulators from www.4Lo.com Here is a good site, use the MPH calculator. Here is the post I mentioned on the 939 t-case. http://www.steelsoldiers.com/5-ton-up/51175-m939-speed-mystery-solved.html If that ratio is actual, it seems you would be way under geared.

I remember another member posting that the M939 series t-case is not a 1:1 ratio in high range, it is (and I'm going off of a bad memory here) somewhere around .8 to .9 to 1. That would help you get a good ways towards where you want to be, and still keep the drivelines at very similar lengths...