This just started all of a sudden, when I push the clutch pedal to the floor I get a very loud grinding noise, if I hold it all the way down it will almost kill the engine. It does it in all gears and neutral. I have heard bad throwout bearings before but nothing like this. I wonder if it could be the throwout bearing or even the pilot bearing. If I only push the clutch pedal down about halfway I can still drive it, no grinding and all the gears work fine. Its a 95 Z28 6 speed with 250000 miles on it but the clutch was replaced about 3 years ago.
Anyone have any ideas.
Ron

 

Could be the clutch fork interfering with the clutch assembly; the pivot point for the fork may be loose causing the fork position to change. Remove your slave cylinder and inspect the fork (what you can see of it).

 

any resolution to this?

 

The bolts holding the slave cylinder had backed out and were rubbing on the pressure plate.
Ron