I'm 99.9% certain the THM-350 output shaft spline counts remain the same for the 70's and 80's, 2WD OR 4WD.
You can replace an 80's 700R-4 with a 70's THM-350 in a 4X4 application and keep the driveshaft length the same by using a tranny with a short 2WD driveshaft, and cutting off part of the splined area, then mate it to the transfer case using an adapter that's about 1-2/2" or 2" thick. So the splines ARE the same. (You wind up with an output shaft that's a little longer than the factory part, but shorter than the shortest 2WD version.)
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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