Ever since I replaced my shocks, I have been getting a chatter from the rear while going over bumps. I have been under the truck and can't find anything that is loose. The front and rear leaf bushings look ok, they are cracked but not falling apart or anything. I heard there was a problem with these trucks and the rubber insulators on the bottom spring but mine are all there. Anyone have any ideas? Do I need to start looking at new springs? If that's the case I don't know if its even worth it.