Hey, that's the first part I broke too...
I would recommend replacing it with a RPM one. They have a lifetime warranty against breakage.
For US $8 u can't go wrong.
Check em out here...
http://www.rpmrcproducts.com/products/traxxas/slash.htm
Ps, once u have taken off the wheel hex, lock pin, and stub axle, the bearings just puts out