I have a 1997 JGC that had the transmission replaced at 86,500 miles,according to dealer it went it to limp mode and stopped shifting into overdrive and wouldn't shift properly.
Now at 138,000 it sometimes slips, fluid is full and clean, seems to do it during or right after making a right turn, I know that sounds crazy but that is when I notice it.

I have as answer but can't figure out how to delete the post.