chattering
 

I recently replaced my master and slave cylinders along with a new clutch and pilot bearing. I replaced the transmission with a used one... this will be my fourth transmission I have replaced. On the previous three, I didn't replace the pilot bearing which,(to my knowledge) caused the transmission failures. Now on releasing the clutch, I get a chattering sound for a split second. If I hold the clutch pedal while it is chaterring the master cylinder leaks the fluid. What is the chattering??????????