Since I got my 2002 f150 a few weeks ago, I have noticed a vibrating or grinding sound. It was windy the other day and I noticed that, at highway speeds, when a large gust of wind came along, I could hear it. Usually I notice it at lower speeds and I was wondering if any one had an idea of what it could be. I am thinking that it is either a loose pipe or something to do with the steering. Any ideas would be helpful!

 

Gonna have to get underneath and shake whatever you can get your hands on. Loose exhaust or maybe even a heat shield.