This is good info to know.

I also have a 2005 wrangler...manual says change the diff fluid every 12,000...front and rear! BTW, no drain plug .

I will also be having a differential fluid changing party at my house....might as well include the x-fire....anyone have recommendations on a good fluid? How about synthetic diff fluid? Those of you that have replaced it in the x-fire, what did you use?