When I start up my stang I hear this rotating metallic noise coming from the bellhousing. Then SOMETIMES when I press or release the clutch pedal I hear the same noise but it isnt as intense. And it seems like when I put the car in reverse almost everytime I release the clutch pedal I can hear it. It doesnt make ANY noise while driving, just when the pedal is pressed in or released. I have a new clutch and pilot bearing... what could this noise be?