I looked at the numbers on the diff. and they read 123 351 0101 that is all i could find. I suppose that means a 3.51 ratio. are these the correct numbers?
I would think if MB made a transmission that has different part no. than U.S. model 240D's, it even has a different clutch setup, than the gearing must be different in some way. Why would they make it identical to another transmission.

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Chris
84 280sl
82 300d euro