The transmissions may need parts swapped. I know the SD uses electronics to record the speedometer speed while the D uses a speedometer cable to do such. Other parts may need to be swapped too. Someone help me here.

-Joe

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.