I have a '01 Grand Prix GTP w/ 93k miles on it.
Starting at about 20-25 MPH through highway speeds, I get a loud low-pitched whine. The noise appears to come from the front-center of the car. This whine is most pronounced when decelerating, but exists accelerating and keeping speed as well. I put the car in neutral on the highway, and the whine did continue, even though the car wasn't in gear. I also tested it directly in 2 and 3, as well as D. (In 1, I couldn't hear it over the sound of the engine, since I'm at ~4.5k RPMs by that point.) I also noticed that the pitch seems to vary slightly by vehicle speed. It is also louder when turning right, and much softer when turning left.
I replaced both front wheel bearings & hubs about a year ago, so I don't think it's the wheel bearings.
Any advice on what might be the cause of this issue? I'd appreciate any troubleshooting help. Thanks!
