Quote:
Originally Posted by mobetta
diff's are the same aside from the gearing. all the 85 123's ive seen had mechanical speedos. to maintain the correct mph on your dash you will need to swap out the cluster, speedo or gears.
all 123's ive seen drivers side mirrors are manual, passenger side are electric.
the tranny controls are a bit refined, the tach signal is different, the turbo ob an 85 has ARV(?) and the IP has that electric thing on it. but as for engine/trans swap you can do it w/ little issues.
and i am sure i forgot some, and am prolly wrong about something, too.
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There will be plenty of parts to make it worthwhile.
First off, it is the '81 that has the electronic speedo. The only year/model W123 to ever have one.
The IP on the '85 has some type of electronic thing on it, but I don't think it's used for anything. Besides, you very seldom have IP issues anyway.
Tach stuff on '85 is different, but then again an '81 doesn't have a tach anyway. You could sell those parts, especially the end of the wiring harness behind passenger side kick panel. {not real high dollar stuff, but it can help somebody} I would try and plumb in the blue flying saucer from the '85 into the '81 for better shifting.
Mobetta really gave good info!