Bad axle u-joint?

There should not be any angle at the pinion if you're running a double cardan CV shaft. This will cause rhythmic vibrations and clattering/noise.
Sort of..
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I was just under the truck measuring angles, spinning the front d/s, took a few pics…. I just found this and probably the source of the noise…. You’ll like this. Note the missing outside clip.

IMG_0551.jpeg

 
Thanks to all for the input, ideas and suggestions. Your help had me looking at everything helping me to eventually find what appears to be the problem!

Thanks for the help!!
 
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