I just had some front end parts worked on a couple weeks ago and I was under the truck looking for why the steering seems to flop around and what a noise was, when I noticed this.
I have driven the truck several times with it like this and used 4wd for a couple mins with no problems with cv. I have noticed a wawawawawaw type of noise from the front end and this may have something to do with it.
See the "ring" thing is missing on one cv wile the other has it. You can see where the ring use to be.
here is the one with the "ring"