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Sounds like a great truck. No wonder you want to keep it.
I'm not sure what transmission you have. My experience is only with Powerglides, TH 350s, and 700R4s.
I would opt for a new transmission - or at the very least a new valve body. Sounds like there is either something wrong in the electronics ( way beyond my experience) or dirt or broken transmission parts in the valve body. There are so many small oil passages in the valve body that it takes a patient and dedicated mechanic to really clean it out. Not worth the effort.
I worked at GM in a friction materials test lab. We ran the crap out of a lot of 700R4s. They failed by twisting a shell drive shaft in two. It was catastrophic - like "BANG - engine revs out of control, emergency test cell shut down" sort of catastrophic. Obviously not your problem.
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