[TripleJackInGA]

I have an 89 Dakota that did the same thing.It was kind of like a Harmonic Vibration that sounded like someone blowing into an empty bottle.It was coming from the seal around the driver's door vibrating, and only happened at certain speeds.It would do it much less when it was wet out, like the seal was moistened.When I got new tires, and supposedly the vibrations in the truck reduced, it went away. I would tell the Service Writer at the dealership to ride while *YOU* drive the car, so they have no liability.If thta doesn't work, go to another dealer.