Are you kidding me? A 3s lipo pack is no-where near enough voltage to move that truck. Assuming you have an 8XL or 9XL, it will be much much faster on 5s lipo, somewhere in the 40-45mph range if you gear it like-so.
neil I am running a xl 10 hey I know can't show this on traxxas site they will not let me post anything