My truck has developed a loud clunk when turning sharply at low speeds, parking lots and street corners. When I listen outside with the truck stopped and someone turing the wheel, it doesn't seem to come from the front axle. It's closer to mid truck, hard to tell with the engine running. It did it all day yesterday, getting really bad. I have checked all the axle bolts and joints, they seem tight. Also replaced the left bearing assembly about two months ago. Any ideas what this could be? Thanks.