Not a real problem. I would leave the rear two speed - getting a two speed rear is/was an option on those trucks that had autos.
An Allison 545 is a medium duty trans that would work well. I wouldn't get used simply for the amount of time that it will sit. You want interior seals in top shape. One that has internal leaks won't last. Whenever I had to replace an Allison trans it was from internal leakage preventing it from building enough pressure to shift.
I used 545s in my bus fleet on those that had autos. It is a good trans. Not real quiet or a smooth shifter, but it would have no problem with the pounds you are hauling. Also, when that chassis was used for buses your engine was mated to a 545 so you know it won't be too much for the trans.
I used to replace 545s with rebuilt units for $1700 out the door and that includes incidentals during install. I would find a good fab shop. They should do it for $2000. Better yet, go to the school district and find an older mechanic to do it on off time. Those are the boys that know that chassis in and out.
The price of good grain trucks is just going through the roof. I wouldn't hesitate to throw a new auto trans in an old manual.
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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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