[coolhandcountry]

Well you figure if you put a lower gear on a truck the amp draw is less the voltage stays higher for the truck will run faster. Not only that but the motor has less of a load so the kv is little higher as well. It should not be for a exact figure but a rough one. The only true way is to get the motors at test them with a speed device. Every body and truck will have a different drag to it for how high the body sits or low as well as the type.