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There is a year range of good 700r trans, have heard that from others, maybe even here. Do some research on which was best. What is the issue with yours? With regular maintenance they go and go...
the 700r4 generally got better the longer they were in production due to upgrades. if you get one rebuilt it should automatically come with those upgrades
You sure the shifting linkage is still connected right?
I wouldn't rebuild your trans. Find a later model 700R4/4L60 or get an exchange unit. Too many design flaws in the early units and not worth rebuilding.