clunking noise
 

So my problem is when the car is in neutral and i press the clutch down and rev it up to 1000rpm there is a spinning clunking noise coming from under the car. I took it out for a drive and listened to see if the clunking was still there but nothing..its only there when im parked and i rev it while the clutch is down. Anyone know what could be causing the clunking noise?

No one has ever had this problem... Im thinking its my diff