Don't go looking for vibrations. You'll get hypersensitive and find stuff to fret about. The driveline vibe isn't a tire vibe. It's a 3k~~ hz frequency that's pretty subtle but it will get your attention. Both of mine didn't do it all the time. Other times it did it bad enough that it couldn't be ignored. I had a friend swap tires and wheels with me for a week. His never vibrated. Mine still did with his wheels. New drive shaft in the '03 didn't fix it. Rebalanced drive shaft in the '05 didn't fix it either. But it was definitely in the driveline between the output of the trans to the pinion in the pumpkin.
