Originally Posted by HeavyD99

You'll need a 72T or 75T spur, I think Robinson racing or Kimberough make them, and a 48T-52T pinion, 64 pitch. You'll need to remove some of the chassis webbing material under where the pinion goes as 48T-52T is so large that it would rub that part of the chassis. If you're not sure what I mean, try that spur/pinion combo, install the motor and you'll quickly see what I mean.