Well, with the rolling and "click, click, click" I'd settle on the bushings and a possibly damaged/broken parking pawl.

Be sure to keep the hand brake adjusted and use it religiously. As TexBill experienced, I too, woke up one fine morning to fine my Benz in the middle of the street. Good thing I live on a quiet road with little to no traffic at night.

The bushing are cheap, getting time to replace them is the toughie.

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Mike Tangas
73 280 SEL 4.5