pops out of 5 th gear on 1993 Toyota Corolla

only pops out of 5 th gear a couple of times and then will stay for 30 or 40 mile and then pop out again, its done it well drive a constent speed

1 answer 1 comment
Most likely to be a internal gear box problem where the synchro hub and outer sliding hub haven't enough tension to stay engaged. Check that the linkage allows full engagement (its not sloppy and worn).
thx,
i will check the linkage