Are there any updates to this post? I have a 2009 G8/GT that is making the same type noise in the rear suspension, passenger side. And, the dealership CANNOT find anything wrong with it. The noise happens periodically and the dealership has been unable to hear it when it is there onsite. And, it seems to happen more often when the rear right tire hits an imperfection in the road. However, the noise disappears after a couple of miles. Any help would be greatly appreciated.