Don't know abou the tranny noise when turning, but the rolling in park is normal. Mercedes will roll a fair amount and click when pushed back and forth in park. The clicking your hear is the parking pawl running up against the window that it engages in inside the transmission.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record