I did a search and found - http://www.chevroletforum.com/m_1082/tm.htm
but I was wondering how hard it is to change out the diff fluid? I changed it out on another vehicle but it was super easy. I have yet to do the ATF but I want to do that with both of my vehicles.
My father in law said it was a pain in the butt for the Tahoes and I shouldnt do it and spend 130 bucks to have someone else do it. However smart he is (I actually do think he is smart) I always have to get a second opinion since it was so easy in my other vehicle.
My wife has a 2005 4.8L engine with auto 4wd.
Thanks for any help given, and im new try not to beat me too bad if I did something wrong :-)