My dad is having an intermittent noise that he describes as sounding like a loose speedo cable. He says he does not notice any changes performance wise when the noise starts and he says if he taps his brakes, or puts his blinkers or hazards on it stops. His truck is a stock 2002 F350 4x4 crewcab. Since these dont have cables I am not sure where to start looking or what exactly to check out. He said he has not seen any check engine lights but I will hook it up to AE as soon as I get a chance to go by his house. Any ideas?