I am the person with the 1999 Ford Ranger that had a clunk in hot weather only. It is now fixed, and I thank you all for all the great ideas you gave me. The problem was the inner tie rods in the rack and pinion steering. I used a Steelman Chassis Ears and found the source of the noise. The noise could be heard with the Chassis Ears, even in cool weather, but could not be heard by the naked ear until the rack heated up. I guess maybe the grease in the inner tie rods thinned after warming up, or the socket got tighter from the heat, or both maybe. Replacing the inner tie rods was mentioned as a fix by one or more of your mechanics, but I had hesitated to replace them because I was afraid I would damage the rack taking the old ones off. The job of replacing them went rather smooth, took me a few hours. This forum is great, and I would like to thank you on behalf of all the people who don't bother to do so after you try and help them.