I just learned that my '81 300D has a transmission out of a '84 or '85 500SEC, behind a 617. ??? motor.

While under the car I looked at the modulator It's RED. Is this correct? some sites I've go to show a black valve and others show a red one.

What effect will the modulator from a W123 have on a W126 transmission?

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MC Professor

1981 300D non-Turbo
with unknown 617. motor and 711.311 transmission

That might be a question for a former moderator named ' Steve Brotherton' ...
in Florida the last I remember.. check the archives....
a transmission expert...
may not be the only one on the forum but is one for sure...

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

Thanks, will look in his posts.

__________________
MC Professor

1981 300D non-Turbo
with unknown 617. motor and 711.311 transmission

Although the part# on the tag that has been attached to the trans corresponds to a 722.311, that does not necessarily ensure that the trans is a 722.311. (An original, stamped in # is much more likely to correspond.)

There can be some doubt in this instance; the diameter of the convertor housing (bell housing) for the V-8 engines is larger than that for the inline engines by about 2".

With the original stamp gone, is there another way to determine correct model number?

__________________
MC Professor

1981 300D non-Turbo
with unknown 617. motor and 711.311 transmission

I think Brotherton was IN Florida...
but maybe some good photos sent to him... ???
sometimes it just takes someone who knows to say ' look for thus and so' and it is a ' whatever'..

__________________
1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html