I have developed a noise above 45 MPH coming from the rear of my 98 convertible. Have it in to my local dealer and they think it is coming from the differential. It howls. Of course they have to tear into it to determine what the problem is. Has anyone else experienced this? Noticed it a couple of weeks ago and I think it has gotten worse. Has anyone else experienced this? My car only has 17000 miles on it. Any help out there.