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Does it sound like anything is grinding, or is it just revving with no response?
I had a 1990 5.0 Mustang with an AT. When it shifted to fourth gear, I got no response, it just revved a lot. I took it in to a transmission shop, they said it needed to be rebuilt. Couple months and $1500 later, I had the problem again. Turns out there's this plastic washer/bracket on the throttle cable that was broken. I don't know if that would have anything to do with your reverse gear though.
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