Ok, you'll have to do a search on transmission vacuum adjustments for the actual tutorial, since I don't have time. But in a nutshell: The more vacuum the transmission receives, the earlier and softer the shifts are.. So, less vacuum means later and harder shifts. The bowden cable adjusts the shift points relative to pedal position. So if you shorten it, you will have to let further up on the pedal before it shifts, lengthen it and it will shift while you still deep in the pedal.

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'79 300D, Ivory "Gunther" ......going
'81 300SD, Metallic Blue Silver, The Grey Ghost.....going
'87 300D Turbo ...gone
'05 CDI.... gone