hello. My car has today on four occasions made a machine gun noise when accelerating away and of course the car didn't drive away properly. There appears to be a minor oil leak where the front of the transfer case meats the drive shaft. Is there a bearing in there? what part of my drive train is not engaging properly? The noise was like if you take the mirror and manually move it up or down manually and strangely thats what i thought it was the first time it happened. dahdahdahdahdahdahdahdah. like a machinegun. then it keeps driving. Have I done a centre bearing any thoughts would be great thanks guys.