I have a 1994 Cherokee that shakes at highway speed. I had a similar problem a couple months ago and replacing the front drive shaft u-joints fixed it. Problem is it's happening again.
I checked the u-joints on the front shaft and they appear fine. Tires are only a couple months old and have been rotated and balanced regularly. I just finished replacing the wheel hub u-joints which were bad and the shaking continues. The shaking occurs in both 2 wheel drive and 4 wheel drive. Does anyone have any idea what might be causing this?