That is pretty much correct. The speedo is based on the rear diff not
the trans. The automatics are all the same (for the w123) gearing and
all the four speeds end in 1:1 gearing. The manuals differ from year to
year based on engine and reivisions.
-Rolf
On 06/03/2010 10:35 AM, Mitch Haley wrote:
Jim Cathey wrote:
No, I correct myself. The speedometer is attempting
to measure wheel RPM, but it's tapped at the tranny
tailshaft. The 85 tranny is _expecting_ to have a
lower tailshaft RPM for a given road speed, and so
gears up the speedometer tap to make up for it.
You put that tranny in a car with a shorter rear
end, and the tailshaft RPM is higher than expected,
and so is the speedometer output.
I thought the MBZ way was to have the trannies all alike, and match
the speedometer head to the differential gearing.
Mitch.
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