If this is all about the ratio, then figure out what ratio you currently have first. It should be marked on the Diff. It’s an old car. It should have the originally optioned ratio, but you never know what it has now until you check.

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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,