The 2 spider gear situation would definately explain it, what a rediculous design. I realize none of you were at the hill when mine blew, but you cannot emagine how easy they broke and how little noise it made. People watching were amazed it broke.

So the 4 spiders should be tremendously stronger? But yet Xterra Racer is still chewing through them in races?

Hopefully I can get a letter faxed off to Nissan today and kick them in the butt. Clearly if I have a 2 spider gear diff they dont have a gear to stand on!

Oh, and I wanted to thank everyone for how nicely this string has gone, trying to work out a very complex problem so everyone knows what to expect, what needs fixed, and how to advise Nissan.