Recently a rear track bar broke on my 2010 Chevy Impala, 160K miles, resulting in that tire swinging all over the place going down the road. I've replace the track bar, but now there is a constant metalic grinding noise coming from that wheel. This is whether it is turned by hand up on a jack or while driving. There's no play when I try and twist the wheel, and the noise is consistent when driving and turning (other than gradually getting louder with increased speed.) I've checked the rotor backing plate and I don't believe it's making contact.
Is it likely that the bearings need to be replace, or could there be another problem?