Interesting find on the 300D: the rear-end was swapped out for a 3.07:1 from the original 2.65:1. That of course accounts for the speedometer error. I just happen to have an extra speedo head from a 4Matic sedan which also uses a 3.07:1 rear end.

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic