I know that sounds like a weird question, but a few years ago my truck developed this weird noise from 40 mph and up.  It sounds like its coming from the drivers side wheel.  The only way I can describe it is a high pitched flute sound.  For a long time I thought it was a wheel bearing but I would bet that if a wheel bearing was that dry it would have destroyed itself after all these years.  I am now leaning toward a U-Joint, either in the short shaft or in one of the hubs.  Any thoughts from all you Dodge experts?  By the way with the super quiet tires installed yesterday I can hear the noise a lot better now.  

 

Deric

I would gamble a wild guess at the door is starting to sag a bit and there is a small gap in the weather strip now. Check the hinges by open they door and lifting from the lower edge. The door should not rock up and down. If it does it would explain a bit of it. As the hinges wear the weather seal isn't as tight. Like on my 1996 Dodge Ram the passenger door is just starting to do this a little bit and is going to require a small amount of adjustment.

I would think door seal or mud flaps.

I had to move my mudflaps 1" outboard for my 19.5s and now I have a low speed whisle.

Hmmm interesting, I will look into all of that. Thanks guys.