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Rebuild the Tranny and motor yourself. You probably just need a new set of clutches in the tranny 300 bucks if you do it yourself and it's rebuilt. Same with the motor, depending what is wrong with it. I would get a running block and rebuild it. Viola new truck.
BTW I just rebuilt a 46re, will be putting it in my truck shortly. It wasn't hard at all.
I helped a friend of mine rebuild the tranny out of his '82 and it really wasn't as bad as I thought. As long as you take your time and pay attention its definitly do able.