This is on my 88 300TE.

So i was under the car inspecting everything and I noticed that when I turn the wheel an inch or two each way there is a clicking noise.

It seems to be coming from the coupling, but the rubber looks ok I don't see any hairline cracks or anything.
Ive never noticed any issues it was solely from the inspection.
Any ideas?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k