Since getting the Z home there was a horrbile knocking from the n/s/f area. At first I thought perhaps it was the ball joint on the upper arm. I had it on the ramp in work today balancing the front wheels & myself & a tech noticed how bad the rear bush was on the banana arm.. It decided to part company with it. The knocking I was hearing was the arm hitting the subframe. I'm now on the lookout for a replacement bush.