i've been trying to toubleshoot a "problem" i'm having with my car makes like a grinding type sound like a mount for the differential is broken. I'm not too sure on the anatomy of that rear end (i have a J30) mainly because i havnt taken a good look at it but something im guessing a rubber mount or something is ripped, torn, gone or something. Somebody help me out as to what it might be, what to look for, etc. Thanx

--brandon