Did the car work when you first built it but then stop working? All of the gears in the TT-02 are protected so if it ever worked then they should be spaced correctly and nothing should be jamming them. There are slots in the cans of most brushed motors. Sometimes a rock can get in there or a tiny screw can get attracted by the magnets and then that will make a terrible noise and possibly jam the motor. Check the slots in the motor and see if there is any foreign object in there. If you attached the motor to the motor mount in the wrong holes but it was pretty close, it might have worked until the tips of the teeth wore off. Remove the cover from over the motor gears and take a look (maybe post a picture of what you find). It's also possible that the set screw that holds the pinion to the motor came loose.
Based on the sound in the video, I'd say you stripped the teeth on the spur gear, probably from using the wrong holes on the motor mount.
