Well, it's referred to as the "steering box," and it's essentially that - housing for the steering gearset. That, and control arm bushings were replaced. My '97 car has 87k, but it's been wallowy since I bought it at 61k.

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

current: 08 C300 Luxury , 92 500SL