FWIW ;
I like a very firm shift and the proper way to adjust your Mercedes tranny is to attach a vacuum gauge to the modulator line and tweak it as you test drive it, the idea being to make it so there's zero vacuum to the modulator as the accelerator pedal reaches the floor and no more than 15" of vacuum to the modulator at any time .
It's a fine adjustment , simply cutting off the vacuum signal makes it shift with a _BANG_ ~ not a good thing , you want a balance between some vacuum but not very much and zero vacuum and it needs to vary with throttle position , engine speeds and load , tricky stuff to be sure .
Anyways , my 300CD's tranny shifts pretty well but the other day whilst working on the central locking , I noticed the two small vacuum nipples on the primary vacuum pipe , were marked differently ~ one is 0.6 MM and t'other is 0.5 MM ~ not much difference I hear you say but , this tranny shift thing is really persnickity so I swapped the tranny's vacuum hose to the smaller , 0.5 MM nipple and the yellow & green pipes to the 0.6 MM nipple and I was rewarded with firmer shifts _and_ the door lock's come On Line much faster as does the HVAC , due IMO , to a larger volume being transferred in the non tranny vacuum system .
Just a thought and yes , I'm a nut but , this makes sense to me and is working great .
-Nate
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