This CRUSHER EVO 390 brushed motor comes with a pinion gear attached. This is the power source, the torque, and the speed. It is solidly secured to the gearbox, which is mounted to the lower chassis for protection. It is in its own compartment, so it won't add its heat to the battery and ESC compartments. Its compartment is well ventilated to dispel any excess heat that it creates. If you are running with multiple batteries, just let the motor cool off for about 5 minutes before starting the next battery, or damage may result.
Does not work in the MT model.