I convert to 2wd when I break parts..

I'm running 1/8th wheels with big soft pin tires in the rear.

Truck HOOKS UP LARGE on grass and takes off like a rocket.

I like RWD better for high speed because you can drift the rear end and turn a LOT sharper. You learn throttle control FAST because parts are expensive and at first its undriveable.

4WD is sweet for when I want to do some jumps or climb dirt mounds and stuff.