MERCEDES-BENZ TRANSMISSION
Steve Brotherton Continental Imports
http://www.continentalimports.com/ser_ic20242.html

722.xxx transmission vacuum modulators
http://www.peachparts.com/shopforum/diesel-discussion/314276-722-xxx-transmission-vacuum-modulators.html

Transmission Vacumn Modulator
http://www.peachparts.com/shopforum/showthread.php?p=1779240

vacuum modulator adjustment - 1980 450sl
http://www.peachparts.com/shopforum/showthread.php?p=1473966

MB manual for 123 vacuum modulator replacement
http://www.peachparts.com/shopforum/showthread.php?p=675982

Modulator Replacement Help
http://www.peachparts.com/shopforum/showthread.php?p=2069428

Transmission modulator adjustment
http://www.peachparts.com/shopforum/showthread.php?p=791654

'80 300D transmission adjustment "Vacuum modulator location"
http://www.peachparts.com/shopforum/showthread.php?t=141111

For a wider range of transmission issue links, use the following thread.
Transmission:
http://www.peachparts.com/shopforum/showthread.php?t=142395