Hey Nick, 1st I wanna say keep it up, your contributions here are priceless (at least to me). I don't see a lot of transmission shops anymore that know much about these. Everyone you talk to, says "we'll be glad to rebuild it", instead of "we'll check out the symptoms" 1st. As in my case, I would think my hardware is good. Hopefully it's something simple in the valve body.
Should I start another thread for this so, I don't muddy up this one?
Also, riddle me this, can a 700R4(4L60) be upgraded enough so they're as strong or stronger than a 4L80E? For those of us living in the non-computer controlled era, it'd be much more easy, to build a 700R4 than add a separate trans controller