Regarding your 4th question about the rear end clunk, it could be a worn out flex plate.
These cars have a driveline that has flexible rubber discs at both ends, and a center U-joint with a support bearing. The front usually wears out, and should be examined anyway considering the car has 120,000 miles.
Your differential mounts could also be broken.
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Paul S.
2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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