georgie,

The swap was very easy! SInce your car has traction control, the diff will be cheaper than one with non-asr. Call around and locate the diff out of a 93 400SEL WITH ASR. Other S class cars use this diff so they can cross reference it. Once you get it, swap the back plates on the two diffs and your good to go. you will have to contact berg works for a black box that makes your speedo accurate again.

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K