hahaha cool stuff man, I read your first part an yes the other guy was me. I also read about crashes idea and then ran with it but in a little different direction.. Also if you look in the thread Outlaw ran with the idea aswell and actually fitted a Robinson racing gear on the center diff, last time I chatted with him he said his thing is indestructible..
I have yet to follow suite with the Robinson gear as I was busy on a few other projects, also I did find that the plastic gear could not hold up to actual race conditions.. IE hard braking and acceleration while coming of jumps.
Here's the thread,
http://hdrcvideos.com/forums/viewtopic.php?f=42&t=17886