Hey Jon, I have a 2000 Ford F150 extended cab and have had the same sound coming from the rear of the truck. At first it wasn't something I noticed because when I bought the truck it was cold out. However as Spring and Summer came around I had all windows opened cause the a.c. unit locked up so had to be able breathe in the Arkansas hear. But I however at first thought that maybe there was possibly a chain or linkage cable under the bed that was stuck or broken. I crawled under and didn't find anything, even had several friends and even my dad look but they all said there wasn't anything. My father is who taught me to do my own work on all my vehicles. So when I took the road trip up to Indiana and had him crawl under with me to look and see if we could figure this annoying sound out and that I wasn't loosing my mind, after ruling out everything else, and aprox. 15 minutes into his overall look through, he turns to me and laughs. Then made me feel ABSOLUTELY stupid not meaning to mind you, however what he told me and showed me was underneath the bed is where the spare tire SHOULD AND MOST OFTEN IS LOCATED. Mine wasn't however. The car lot I bought it from failed to replace it. So the bracket that holds the tire was rattling around and once we put the spare back under there as it SHOULD'VE BEEN, the metallic jingle, chain rattling, link rattle or whatever you may call it, IMMEDIATELY QUIT and instantly I knew then I wasn't going crazy. Lol so you may want to also look into that. Thanks, Angel Kolstedt

 

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I moved your post to a new thread. The one you found and posted on was from 2001