I was at a local shop having a new set of tires installed on my 17 GT - premium, non PP. The installer noticed a lot of play on the drivers side rear wheel hub, he showed how it would rock back a forth. A new rear hub/bearing assembly was installed. An alignment was also done on the car. I now hear a metallic chirp from the drivers side rear when I back out of my driveway and when taking off from complete stop in 1st. I also hear the chirp intermittently during 1st-2nd gear shifts. Anyone have any ideas as to what a possible cause might be or things I could check?