jnv255

Did you put a new release bearing in it when you swapped clutches? On my first aftermarket clutch, the idiot I had do it said "they looked at it and it was fine.." After he originally told me a new one was put in, but everyone that worked there liked me more than the owner and told me a new one wasn't put in.
The car had maybe 16k miles on it when I put a crappy DYAD twin disc in. It made a squealing noise (for lack of a better term.) It shifted fine and it kinda reminded me of a fan belt, but not very loud. So I took it back and the person who put it in listened and said it was a belt or some crap. Went and saw a buddy at Chevy in the service dept and he said throw out/release bearing right away. Long story short, I made the original person re do it after they lied to me about putting a new one in and I watched every minute of it like being corrected like a HAWK. If you didn't put a new one in it, pull the clutch, put a new one in, along with everything else in there and maybe add you a remote bleeder as well.

EnginerdVT

With the Mantic9000, it comes with a brand new throwout bearing as part of the package, which is GM's factory part. I did not, however, replace the tiny pilot bearing at the front as it was very clean, a PITA to remove and did not come with the kit. I spoke to some very experienced chevy corvette technicians and my installer, who is also a master tech and vette specialist, who all said that replacing it was this little mileage was not necessary. After swapping the throwout bearing and clutch assembly with the newly provided one from Mantic, the sound is completely gone so there seems to have been a defect of some kind, likely with the bearing/slave assembly.