Thanks guys. I think in the next couple of weeks I'm going to try new rubber on the coil springs, the 19mm ones. They are pretty cheap and shouldn't be too hard for me to swap. And I'll replace the carrier support bearing and rubber around it. If that doesn't work, and my flex discs still look fine, I think I'm just going to live with the vibration until something more noticeable shows up. Unfortunately, I could replace most of the parts in the rear and still might not get rid of the vibration. Thanks again, I'll update everyone if I find a fix for my problem.