My 1992 RS has the T5 5 speed manual transmission. shifts 1-5 perfect with no issues at all. but in reverse it keeps popping out of gear and will not stay in gear when trying to back into the driveway which is a slight incline. any idea as to what it may be? bent shift fork? synchros?

 

yep, those would be my first suspects.

 

No sychro for reverse for a T5.