well also i forgot to add, i dont know if its nomal because i never really listened to it but i took the motor off then when i pull the truck across the floor there is a clickin in the back end. but ithe sper gear looks good, it was tight when i was driving it. it never started doing this before but i hit a hill and the truck flipped ove about 4 times and landed upside down then when i turned it back over i made 1 pass then it stopped pulling.