I recently have been frustrated trying to figure out some knocking noise coming from my rear passanger side wheel well I have a 2001 WJ limited 4.7l with 29,000 miles on it. I have installed the addco front and rear sway bar which I thought might be the problem but it was fine for a month after installtion. Everything is tight and I can't see anywhere where it would be hitting. I suspect it might be a shock since they are stock and it didn't start till it got very cold out. But if I rock the vehicle I cannot duplicate the sound, only when in motion over bumps.