hey guys i finally got my rc running today its a TT-01D chassis and i had 2 runs today and by the end of the 2nd run i think the motor died, like i can hear the motor reving but the car wasnt moving. i thought it might have been the gears so i took it apart and the gears were in contact and everything but when i took the motor out and gave it throttle the motor worked but when i put it back in the car doesnt move. can anyone suggest what the actual problem is?

thanks guys