I'm sure some gearing and you can get it to go 47 .. maybe even 50 with a sort of dramatic change in the spur and CB ..
like going 22t cb and the least amount of teeth you can find on a spur... but then your truck wont have much bottom end.. the truck is great just to bash around n have fun ! dont worry about top speed its not to much fun just driving in a straight line back n forth.