I'm pretty sure I know the answer, but I want some opinions...
'98 Z28, T56. New clutch, master, and slave. The car shifts smoothly and flawlessly in every gear. Except...
A little bit ago I was messing around on the freeway (out in the middle of nowhere, nobody else around). In 4th gear, RPM's climbing, I did a fast 4-5 shift. It had a quick grind right when it went into 5th. It stayed in gear and didn't pop out or continue to grind once in gear.
I slowed down, sped back up again, same thing happened. Only grinds right when the shifter hits 5th. I tried a 3rd time, but this time as I got close to redline in 4th and prepared to shift, I took it easy and shifted slower and more casually into 5th, and it didn't grind going in. Under normal driving conditions, it doesn't grind 5th (or any gear). Also, it downshifts from 6th to 5th easily without trouble.
I'm assuming this is a syncro problem, although 5th doesn't seem like a common issue. Will the grinding eventually get worse? I never noticed before because I haven't tried to speed shift into 5th, because when 4th tops out I'm usually around 115mph or so and don't feel the need to keep going.
I know if the grinding continues it will only do more damage (and cost more when the time comes for a rebuild) but it only happens during a quick 4-5 shift at high RPM's. Syncro problem? Should I be worried?