4kq rear propeller shaft

[Mason Bender <mbender@freenet.columbus.oh.us>]

Dear Quattrophiles-

I know many people have met with the demise of the center bearing in the
propeller shaft to the rear diff.

Could someone please take a moment and describe the symptoms of the failure?

I think I am probably at the begining stages of this, however I am not
sure.  Currently my 4kq (126k) whines from the middle of the car.  The
sound is especially noticable inside the car (barely noticable outside). 
The whine is only audible in cold weather, and is vehicle speed dependant.

TIA for any info,
Mason B