I am with benz on this one, he recently gave me some crucial advice to my gear whine problem. Search for "humming noise while driving over 50" something like that. I chronicled my journey through Chrysler hell. Anyways I was able to replicate the sound when I test drove the car with the dealer. Its all about finding an honest dealer. I lucked out and the second dealer I took it to replaced the differential... low and behold the whine is gone and my car actually shifts much smoother. I repeat REQUEST A TEST DRIVE WIT H THE DEALER and replicate the problem so they can't deny the noise. This happened with the first dealer I took it to, what an idiot that guy was. Anyways best of luck to you... oh by the way I have an early 2004 as well.