There is not a metal spur gear set for the CT4S/R. But you can use the metal 43T Spur gear from the Genesis. Part #GS087. You will be replace the 42T plastic spur gear. The second gear from the Genesis will not work. But I have not had any problems with the plastic second gear. It was only the first gear that kept on losing teeth. Look at toyhaus.com for parts.

On the wheels not moving bennydhill, check and see if your spur gears and bell housing gears are meshed good (touching properly). Also check to see if something is binding the belt from turning like a small rock or even a pulley or the differental is not moving. A bearing in the diff or pulleys could be bad. Just check all the pulleys, diff and belts to see if anything is stopping them from moving.