Truck is a 99 5.9 auto. I recently heard a ticking sound when I shut the engine down. It happens at the same time the belt squeak is happening. I don't know if this has happened before (first time I heard it) but it makes a ticking sound about three times, tick,tick,tick and thats it. It is not very loud. I am not having any problems at all with the truck and it is running great. Is this just a normal sound at shut down?