Man, why would you even want to ruin that buggy by putting a 2 speed on it. It wont be of any use for racing at all unless you are running on a 1/4 mile race track. If you want more top speed change to a high number clutch bell, 2 speeds are designed for street use only because large amounts of dirt will destroy it and you will have waisted all the time and money putting it in. Work with your gear ratios and you can find the speed your looking for.