Popping sound under the front end

I keep a popping sound under my front end everytime I hit a bump or dip in the road. My alignment is okay. Also when I make turns or turn my sterring wheel while stationary, I heard a dull tone sound. It sounds like a muffled bell. That's the best description I can give you.

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The 2013 Ford Explorer has electronic power steering. My son and I both have this type Explorer and his steering motors had to be replaced on his possibly because of the lack of grease due to a complicated grease method? Any diagram of this steering would be appreciated.

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