HPI sprint 2 sports - having loud clicking sound when throttle

Hi,

My sprint 2 sports was running fine this morning on my driveway but when I drove down to the asphalt road, it start to make a loud clicking sound.

I thought there're small gravel or stone stuck that got stuck in the car but found nothing. Please advice what's wrong?

Thanks!
WSOL01

sounds like a driveline problem probally in one of the diffs, if not there than probally a gear somewhere with a few stripped teeth you just have to take it apart and check for youself, hope i at least helped a little