Not enough rear drive is what the stock set-up gives you. The same thing RCShox has been working on with the V2 center diff. To much front drive will make the truck easy to drive but will be slower around the track in most cases. You will loose the ability to accelerate off corners and make larger jumps that most tracks are building in there layouts. This truck has more weight on the rear wheels than front. You will want more power or equal power to the rear than the front.