Jerry, I was looking at a Jeep to purchase last year. It has the same clicking sound coming from the front end. An old transmission guy I know said there was a part of the 4 wheel drive transmission on Jeeps that went bad and this was usually a sign of it. He said it was because someone hadn't changed all 4 tires when they bought new ones. They had only purchased two tires at a time and changed them out. I don't know if it's true, but it's what I was told. Ralph