The noise only comes when the clutch is released. So foot up at idle and as you rev the engine the noise increases. But if you push the clutch in the noise stops. It happens about 65% of the time but it doesn't always do it. The noise definitely sounds like it's coming from the back of the transmission. (Drivers side) not up by the clutch and pressure plate but towards the back. Any ideas? Do some of these focuses do this? It shifts fine and doesn't exhibit any issues besides the noise.