When my ball joints and lower control arms were done, the issue wasn't a groan, but rather it sounded like sitting on a worn-out mattress when going over low-speed bumps, not noticeable during braking - kind-of a squeak, not a groan.

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL