A new clutch kit is sometimes called a a3-piece clutch kita� because it containsa-drum roll pleasea-three pieces. For example, a Centerforce clutch kit contains a pressure plate, friction plate (aka a clutch disc), and a Centerforce throwout bearing. The duties of the first two may seem obvious, but what about the Centerforce throwout bearing? A Centerforce throwout bearing is what actually allows your clutch pressure plate to freewheel while the clutch is pressed in (released). The Centerforce throwout bearing also has to handle the pressure of the clutch springs while it's spinning and absorbing all that engine rpm. Think about that for a few minutes, and you'll develop the healthy respect for the Centerforce throwout bearing that we've developed. If your clutch makes a rumbling noise when you have your foot on the clutch pedal, but it goes away when the clutch is engaged, your throwout bearing is suspect. If you have a stock clutch and throwout bearing, replace the whole unit with a Centerforce clutch and Centerforce throwout bearing. You'll get the long life and killer clamping force of a Centerforce clutch, and a brand-new, whisper-quiet Centerforce throwout bearing to go along with it. This product ships in approximately 1 days