This is great, I just tore up my clutch bell trying to get the pinion gears off.

Quick question, I noticed in the last picture that the pinion gears where pretty ate up. Mine are the same way, Did this happen because the motor shifted? I am asking because I replaced the gears and set the motor. When role the truck the gears seem to bind up during the rotation. It still rotates completely but I am afraid to run it this way. When the parts are seperate it all spins fine. Is there a proper way to mount the engine so the pinion gears match correctly with the transmission?