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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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