The TH 400 transmissions I have seen had an electric downshift instead of a cable like the 350 and the 700-R-4s. The 1984 6.2 diesel pickup I had came with a 700R4 transmission and it didn't hold up too well under a strain. I changed to a TH-400 and used a manual down shift detent cable instead of the elecric down shift switch and the transmission was tough and never gave any more transmission trouble and the fuel milage was actually better considering it didn't shift up and down all the time under a load. The 700R4 had to be run in drive under a load so the overdrive was pretty much useless. Of the choices you listed the 400 is probably the heavier duty of them.
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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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