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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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