Replacing a steering box is child's play, 2 metal lines 14mm and 17mm, 12mm keeper bolt from steering wheel shaft to box, 4 14mm bolts holding the box to frame and I believe its a 19mm castle nut holding the pitman arm to the steering linkage. Also, $300 for a steering box is ridiculous. I paid $50 for the one from a 95SR for my 89. For a bolt on replacement (and easier shopping) all Gen1 boxes are interchangeable. If you replace the pitman arm the pitman shaft nut is a 32mm?

I still think he is refering to the pitman arm and not the shaft. Those threads on the shaft are pretty sturdy.