Where do I get an overhaul manual for my automatic transmission?

You can get ATSG manuals at Transmission Exchange. I recommend you have two or more manuals at your disposal. I find that, many times, one manual will cover a particular subject better than another, while just the opposite is true on another subject. I am currently working on a CD ROM 700 manual that will be complete, so you will not need to reference another book, unless you want a second opinion. Stay tuned, and I will have the manual done soon (I hope.... what a job!!)