One thing to watch out for is snapping the center diff dogbone to the rear on the MT1 with the O.S. 18( happened to me ) i have that setup and OMG its got toooo much power and torque. I have screamed past other trucks and such on pavement that were W.O.T and i still had atleast 1/3 to 1/4 throttle left so you might end up having your son beat you or you might end up keep the truck for yourself