It is a low pitched whine. We have replaced the tires. Are you saying that I should put the car up on stands, then start it, and put it in gear, and run it off the ground? I can do this. There was someone on the other tech forum that said somthing about getting up to speed, engaging the cruise control, then shifting to neutral. If the sound went away, it was somthing else. Ever heard of this? I dont remember if it applied to this model. I can get my money back on the differential if I put it in, and it is not the problem. I will try and run the car in drive, off the ground, and see if I can detect the noise. Thanks for your information.

Rod