When turning right only, it sounds lke a coffee can with rocks rolling around under the back seat at the passenger axel wheel, when driving straight, the sounds stops.

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1998 Land Rover Range Rover 66K Miles
1988 300SE Totaled in 1998, hit by drunk driver, but we walked away OK
1989 420SEL 140,000, just warming up. Total by 18 wheel gas truck rear ended, but refused to lose another MB. Had it repaired cost $10,000+ Great Car again SOLD it for a 2003 C320 to save on gas
1991 2500 Suburban 454, 130,000, Best truck in the world. SOLD it out right.
1952 8N Tractor 1,000,000-/+

Have a look at your rear flex disc at the diff, Mercedes version of the u joint. I have a 124 body, and when they first start "going out" it always sounded like the noise you describe, and I also thought it was from in the right rear. You may also hear some noise when you shift into gear.

Just a thought,

Rickie

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89 300e 275,000
87 260e 265,000
72 Datsun 240z
70 Datsun 240z