Thats very disappointing to hear. Tourqueflite used to be the worlds standard for durability. They were installed in Roll-Royce for a while there.
Being a cheapskate, I have never changed fluid in an A/T before 100k. But, now that you are talking little mopars, I put 143,000 on a 92 Spirit and finally sold it, get this, because the trans wouldnt shift. That one I changed the fluid on. And the governor. And the whole valve body. Then the name on the title.
Didn't get much sleep last night, then had to do the stress test thing this afternoon. Sorry, just feeling ornery.
Still P.O.'d about the vise.
Bottom line; change the fluid but don't worry about "flushing". and put the lid down if you do.