Yea, I guess the sound can be seen as a howling sound. The sound can be best described as wind blowing into a hollow area...so yea, I guess thats a howling sound.
Nick, thanks for the info. I'll check the CV joints and the U-joint when I jack up the car tonight. Hopefully some good old grease will provide a temp fix since the holiday season hasn't exactly left me a rich man...*crosses fingers*
Anyway I can check the bearings and gears in the rear diff without pulling it apart?