I've got an 05 MR and I just HAVE to figure out what I can do about this new noise that came up. Its on Decel at any speed. I changed fluids (not evo recommended name brand but thats all I had) checked the plug (was a little gunky) and I just want to know if the rear diff is going out? Or is this fairly normal after a while? Its fairly loud. I tried searching this on here and didn't really find anything. Anything helps. Should I rebuild, replace, and whats the urgency? I ask because it seems to be more or less unheard of. Thanks guys.