My son's Matador is making a strange noise. There is a clicking or snapping noise that seems to be coming from the drive shaft. We have it up on the lift and there's nothing bumping against the drive shaft. Turning the rear wheel by hand it seems to happen about once each revolution. Could this be in the rear end? Any suggestions on what to check? I also noticed that both rear wheels turn in the same direction. Does this mean the car has a posi rear end? Thanks, Todd