“Vibration at highway speeds” is a common search online.
For those of us that own 30-year-old Jeeps (well mine is 29, but who’s counting), rattles, squeaks, and vibrations give us something to work on in the garage.
I just got done making a 5-hour road trip in my Jeep Grand Wagoneer, and I noticed above 60 mph I would get a vibration.
From the research I have done, the vibration is likely caused by a bad U-Joint or possible the driveline is out of alignment. There are other reasons, but these are two things to check first.
From my searching, here is a multi-part tutorial on the types and brands of U-Joints.
Take a look…
These videos helped me in understanding my options:
Part 1: Universal Joint Introduction
Part 2: Universal Joint Comparisons
Part 3: Universal Joint History and Terminology
Part 4: Universal Joint Driveline Inspection
Part 5: Universal Joint Tools and Removal