good dozer gear motor

[cosworth34677]

hey guys im about to do my summer project and build a dozer. but i need some good gear motors. i need something strong but not to large. im building a dozer that not tiny like the bruder but not huge like a mining machine, just a average sized machine 1/14 scale. good load for a lowboy sized dozer , if that all made since something good thanks,

also i'd like to keep the volts somewhere in th 4-11.1 range so i can use regular old esc's