Hello all! Ever since I have had my truck (May '05) there has been a slapping coming from my rear springs when going over bumps. I just replace my OEM Bilsteins that had 140k on them. I thought that was the problem. NOT so....the slap is still there not as bad but still there for sure! The rear looks to be in good shape and seems tight and all. What can I do? The truck is a '97 Z71.