2003 Rear End Noise

I have the dreaded "rear end" noise on my 2003 Explorer 4x4 (tow pkg / LS) From what I've read elsewhere, this is a well known issue. Here's my question:

Do I need to get this repaired ASAP or should I wait for it to go out? Will changing the fluid help at all or is that a waste of money?

Wasn't it FORD that used to advertise "We have a better idea"? I have a better idea for Ford... :loser:

i have bought one few years back and thought it was just replacement of simple bearing well it was replace and sound just kept going on and i have been driving it with simple noise well now its time to be replace since when i gear into drive you can hear a bang noise when i shift it so know its flebay time to find new one when you ready there are tags on your rear also called (carriers) witch specify your ratio numbers on your rears must be replaced with the excat ratio on them for example mines ratio is 3.55 shopuld fit between 2002 /05 models if iam not wong,, but dont get me worng your might be just bearing for vest prices look around i paid for mines very chaep i the 59.00 ea for replacement