Drive Train Issue
New to the site. My wife has a 2004 4.0 6 cylinder Grand Cherokee. While crawling underneath the vehicle I came across an issue with the drive train. It appears to have a seal that has retracted or shrunk right where the drive train meets the u-join. Can anyone tell me what this issue is? Do I need a new seal? I took a picture but can't figure out how to load it. I am an infiniti guy and my wife is just now letting me work on her Jeep.