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...

1 answer
You better get to a transmission shop while it's still running.
Here's a directory link for you: