Sounds like my differential is dying

My Z started making a really weird noise all of the sudden on Friday, and it sounds like it is coming from the differential. It started as a loud clunking noise that wasn't consistent, but would happen upon acceleration, cruising, and would eventually turn into a muffled whine. I tried to get some audio of the clunking and whining, but I couldn't get it to clunk at all. I know it's not the normal differential mount clunk, the clunking sounds much worse. I read on here about other people with dead differentials, and my story sounds the same.

Here is a link of the sound clip of the differential. Sorry it's not high quality, I recorded it using my cell phone. The noise starts about 15 seconds into the clip. You can also hear my exhaust, it sounds purdy

Link

Sorry, I had to host the file on rapidshare, our board won't support files this large.