Warden,

What kind of vibration and does it just occur when you hit bumps or does it cycle up and down with speed/rpms.

I'll tell you, I don't think the bump test works with Bilsteins/MB OEM's. You just have to check for leaks. I replaced my OEM shocks with Bilstein's about a year ago and the ride improved noticably, but to be honest, I think the original shocks were still OK. However, I did not have a before or after vibration of any sort.

Give us some more info on the vibration and I'll try to help you out.

JCD