Hmmm
You should have a little vacuum modulator on the back of your transmission right hand side. I'm guessing you've got a 722.3 transmission - correct me if I'm wrong.
You should be able to follow a vacuum line from the top / back part of the engine down towards the transmission...
Have a look at this thread on BenzWorld for loads of information about adjusting transmissions
DIY W123 Transmission Diagnose and Adjustment 722.xx OM 616-7 - Benzworld.org - Mercedes-Benz Discussion Forum
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