Several years ago our friends box kept moving on the beam. I welded the clamp to the beam. The box no longer spun, but he soon found the next weaker spots, which was the tie rod ends, the steering box cap, tie rod tubes and the ball joints. Physics are sometimes simple "for every action there is an equal and opposite reaction". If you have a ridged u-joint and the box moves what is next in line to break? Where is the misalignment forces going to concentrate? Is the flexible rubber coupler acting as a "fuse" to protect the next weaker part?
Food for thought.
_________________ Roads.... Where we are going, we don't need roads!
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