[A930Rocket]

I was going to say, remove the sway bar and take it for a quick spin. That will eliminate one variable quickly. As you start to remove it, you may see rubbing marks on both of them if they are making contact.

How old and what type of motor and transmission mounts do you have… rubber, urethane, solid, etc? Your engine and transmission may be shifting, just enough to make contact with the sway bar.