Thanks CEN,

As far as performance, I've never seen a stock Genesis in person but I think It can do every thing I see in the videos except wheelies (no center diff lock) but with more painful landings. It will spin all 4 tires on dry pavement with no problem and cruise through 6 inch tall grass with some bogging. I'm almost hoping the engine blows up so I can try the Saito 182 with more then twice the HP I have now.

The extra weight is definitely testing the parts. My latest breakage was the front differential pinion gear. I think it walked forward and shattered after hitting the aluminum differential case.

I have been doing some research on diffs and I am assuming that the Genesis is using the "standard" 7.5 Kyosho size diffs.
I have found some aluminum diff cases at:
[link=http://www.unlimitedengineering.com/cgi-bin/store/13551.html?id=GHFUgCJ4]http://www.unlimitedengineering.com[/link]
It looks to me that the Genesis diff guts will fit, what do you think?

They also have a 7.5 8 spyder gear "bombproof" diff for Tmaxx's but my only problem is with the diff drive cups breaking at the spyder gear pin hole. It doesn't look like their drive cups are any stronger unless in material or hardening.

The Ofna Torsen diffs look cool and would be great for when the front tire lifts while cornering. Does anyone have any experience with one of them? I don't think it would last long for me but maybe?