When I replaced the tie rod ends on the drag link I made one error that took a while to locate. The bolt I installed in the wrong direction. I installed the bolt with threads pointing up. Every once in awhile the bolt would hit the arm for generator exhaust hanger. I could not find it until the bolt bent the arm for the exhaust bracket. What I found was the drag link would twist up and down on the tie rod ends during the movement of the steering wheel. The amount of movement would also depend the load that was being exerted during the turn. That is one reason it would only make noise once in a while.
When I would crawl under the coach to check for the noise I would extend the generator slide to give me more room under the coach. So when the generator slide was out it also moved the exhaust bracket out of the way of the tie rod end.
Once found the problem I turned the bolt around and straighten the bracket no problems since. Hope this helps you find your problem. :thumbup:
There is a small u joint on the steering column shaft.