[Overdriven]

Use "Traxxas E-Maxx (3905) 1 speed or 2nd gear" option for the transmission, which is a 1.83333333 ratio. With that big motor you should be able to gear it to 45mph without issue. I'd pickup a 62T spur to go along with that 34T pinion, get you a couple more mph and they're cheap. A 58T Jato spur fits the slipper, but I don't know if its too small to mesh with the pinion or not.