If I'm traveling at 75mph and drop it down to 4th gear and then into 5th I get this annoying grind when I'm pushing from 4th gear into 5th gear. It does not happen at lower RPMs, only at higher RPMs.

What's going on here? I have a 1998 GS-R with 50K miles. I swear, I'm gonna be livid if it's the clutch already.

Thanks.