[SSLance]

I fought very similar NVH demons with my G-body...for over a year as well.

I finally bit the bullet and went to Inland Truck Parts to have them build me a brand new drive shaft after trying everything else.

They wouldn't build me a shaft smaller than 3.5" in diameter in the length I needed, so I had them build me a HD steel 3.5" dia. drive shaft and it was a night and day difference immediately over any of the 3 other drive shafts I'd had in the car before. I was pissed that I'd waited that long to upgrade (the 2.5" I had shortened for the 9" was supposed to be balanced perfectly).

Apparently a drive shaft that long turns into wet noodle at highway speeds if not the proper size...chalk me up as a believer as well.

Now, about those tire beads you say...