Thanks, smj. Is there any benefit to greasing the other side of the rag joint--the section between it and the firewall? Granted, it's hard to see if there is even an area to spray back there to begin with.
I squeezed a few drops of Tri-Flow penetrating oil down where the universal joint is and upward where the rusty section of the shaft enters the rag joint, but that didn't quell the squeak.