My 90 300E 4matic with 66,000 miles is making knocking noises from the front and some clicking in the back. I replaced the front struts and strut mounts as well as the front sway bar bushings, and in the back replaced the rear shocks and rear sway bar bushings. However, the knocking (front) and clicking (rear) are still there going over irregular rough road surfaces. No noise over speed bumps, though.There is no play in the front wheels (ball joints) and visual inspection of the motor mounts looks fine. In rear there is no visble wear in the 5 link suspension.
Any thoughts on possible causes?

Two additional points. Front noise is coming from driver's side only. About 15K miles ago the left front axle shaft was replaced which required the ball joint to be loosened for installation.

Have you checked Wheel bearings?

And from the above post, it's a little vague....so have the ball joints been replaced, or simply loosened/adjusted?

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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

please describe the "clicking" sound with more detail.continuous or intermittant.ect

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michael cole 1980 300SD gone now but not forgotten,87tdt,90 300te 4matic 95 e320 wagon

The ball joint was just loosened, not replaced.
How do you check for a bad wheel bearing?
The clicking is intermittent.