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Is this on an sr20det transmission made from 1989-1995
Some of those years have a synchronized reverse, and some do not. I think the ones without have an easy-to-break fork for 5th gear. It loses a leg and then grinds going into 5th. Or gets stuck.
Its the only thing that comes to mind immediately. 5th is really weird to lose. Its tied to reverse. I would suggest you find a spare trans immediately, and,
when u get time swap them out. then pull the bellhousing off this trans and just look for anything obviously wrong with it (they are pretty simply, just using eyes and turning the parts can tell alot)
If you are not using a stock shifter that could be an issue
Also make sure you have a new nismo slave and new clutch master and a braided hose. Those parts are all cheap no excuses.
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