Your number for the spedo is the same as my 80 240D.
the spedo starts at 10 mph, if that is what the po is refering to.
use a GPS to get the exact reading on MPH.

Your Differential should be a 3:69. looking at the rear cover of the diff., the
ratio is stamped on the lower left corner of the diff case. scrape off the dirt
and grease and a set of # will reveal them selves. should be the last #.

with a GPS I found out my 300D is off 10mph at the higher speeds. the lower
speeds it seems to be more acurate.

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works