Quote:
Originally Posted by JARblue
"Most commonly, 5th gear grinding seems to be due to the synchros wearing out..."
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Sticky: 370Z Transmission Failures (6MT)
5th gear "crunching" with shift
Synchros in these transmissions seem to be very fragile; not necessarily due to wear and tear. It's kind of a crap shoot whether a brand new transmission will end up any better than the one you have.
My first transmission was grinding in 3rd gear, and I had it replaced under warranty. Now the second (new) transmission exhibits similar symptoms as yours, in 5th gear. I am so far unable to find a place that is willing or able to rebuilt and upgrade the synchros...see
Built Manual Transmission
--ZOM