Yeah, I changed my front diff oil this afternoon and wow, what a difference. If you plan to do it yourself, make sure you have the 14 mm hex key (allen wrench), but I would get the 14 mm hex socket
from Sears first; forget the "allen wrench", unless you have a short breaker pipe to use over it, for leverage (thing was on tight); even then, I'm gonna pick up a socket fitting for the next time.
I like to do things myself, but can understand situations where it's not the best option (it is messy), but avoid the dealer and go to a reputable (not a jiffy lube) place and have them do the change. Be sure they are aware (if not go somewhere else) on what to use, as far as synthtic and if you need the LSD additive (eg QD II )..