Transmission grinds when i shift in reverse(automatic trans) on 1993 Acura Integra

When i turn my car in the morning and i try to shift in reverse(automatic)it grinds and wont go in reverse but i let the car warm up and get the idle down and i try it again and most of the time it will shift into to reverse. The other day it started grinding while it was in parking in the morning...

Asked by for the 1993 Acura Integra
You better get to a transmission shop while it's still running.
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