Q: Transmission problems on 1993 Geo Metro

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I have a 1993 Geo Metro convertible. I just replaced the clutch plate and drove it this morning for the first time. After 30 miles, the transmission slipped out of 5th gear and would not re-engage. After another 15 miles, the transmission started a grinding noise. What could the problem be?
(1) Answer
Mine is doing the same thing. Might be coincidence that it went out right after replacing the clutch. My guess is the fifth gear is stripped and worn out. Some small foreign cars have a plate allowing for access to the fifth gear without pulling the tranny.