Date registered: Aug 2016
Vehicle: 1994 S600 Coupe
Location: Northern Alabama
Mentioned: 8 Post(s)
Quoted: 270 Post(s)
Inspect the lower front wishbone inner bushings, front and rear. If they appear to be off center, bulging, or lopsided, replace them. The rear ones are fluid filled, and can rupture if old, or improperly installed. Both front and rear bushings must also be installed in the control arms with a particular orientation. New replacement arms have been known to have the bushings improperly oriented. There are instructions in the DIY section.
Disconnect the upper control arm from the spindle. You should be able to move it up and down by hand against the resistance of the bushings. If it or the upper ball joints are frozen, replace the arms. If the upper ball joints are split, but the joints are still good, you can replace just the boots with ones from a Porsche 928. Do a search here for a pictorial on how to do it. While the upper control arm is disconnected, make sure you can move the spindle assembly pivoting on the lower ball joint. If the lower ball joint is frozen or extremely difficult to move fore and aft or in and out, replace it.
Make sure the sway bar body mount bushings are good. They should be considered a wear item and periodically replaced. They can wear so badly as to create metal to metal contact.