shake U-joints for me also as a first look. Check it with the rear end on jackstands and see if you get the shake. Will probably be less than on the road but still noticible. You can also just check them by hand first. Grab each one with car in park (off) and jacked up. ANY slack at either end is a problem.
Let me check tonight, I think they are in pretty good shape. I believe the reflector in one of them was warped. I also have some of the side trim all of it came off of a 72 Ford F250 Glen