So I got my backdraft in tonight (7/29) and ran it. It was amazing, extremely responsive very powerful. Well my roommates gf wanted to try it so I put it in the parking lot and boom not 15 secs later she hits a car. Now the odd thing is the buggy wasnt going more than 10 miles an hour but not Ive got a grinding noise in the front differential only when the buggy's wheels are moving fast and its only at one point in the revolution. What should I do and how should I fix it?? Any info would be helpful.

sounds like you stripped the diff or pinion gear so open it up and replaces the parts