Last month my '91 turbo began grinding intermittently when I shifted into 5th. I knew I had a bad clutch master cylinder and replaced it. The car continues to grind when shifting into 5th, regardless of whether i double-clutch, unless I leave the clutch disengaged long enough for the engine speed to settle to idle, at which point I can select 5th with no problem. I do know that my clutch pilot bearing is on its way out, could that be causing my problem? Or is the synchronizer a more likely suspect? None of the other gears, including reverse, ever grind.