95 mustang. I've been hearing a fast knock, a rattle if you will, from inside the car. Kinda sound like its coming from the drive shaft but I can't hear it when I'm underneath. Motor mounts look good, as well as the trans mount. Nothing is loose, I don't think. The u-joints don't look too bad either....but what the hell do I know. Has anyone else experienced a similar problem and solved it?!