clutch on 1991 Nissan Sentra

my 91 nissan has all its gear on the manual transmission but fifth gear. when i try to put it in to gear it just makes a grinding noise. some people saied it is the clutch fork. and some say its the clutch. what could it be?

Asked by for the 1991 Nissan Sentra
if it is while you are moving, then it is a bad syncro assembly. that requires removal and disassembly for the repair. if it is when you are standing still, then it may be linkage or a bad pressure plate.

roy