“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