I’ll try to keep this short…

If you check my other posting from today, you can see that I have been “dialing in” my transmission and have it working SO much better than when I bought the car, however there is some fine tuning that I would like to address.

The primary concern is that at any rate of acceleration, the shift from 2nd into 3rd gear seems a little softer than it should be for a MBZ transmission. (3rd to 4th is right on the money; firm but not jolting.) The other (minor) concern is that the shift from 1st into 2nd is still jusssst a tad to harsh at light throttle, but good & firm at both moderate & hard acceleration.

In a previous posting I found a reference to an internal adjustment on the vacuum valve (the calibrated leak point) on the injection pump. This adjustment apparently changes the span or range of the vacuum drop-off, independent of adjusting the length of the linkage rod to the valve. Could someone please explain how to adjust this function?

Please tell me if I am wrong on my approach here: I hypothesize that by increasing the range, the vacuum will be higher at the modulator during light throttle, which should soften the 1-2 shift at very light throttle acceleration. At more moderate rates of acceleration, if I tighten up the control pressure via the Bowden cable by maybe ½ to 1 turn beyond spec, this will help firm up the 2-3 shift, yet the 3-4 shift should not be that much harder because of the natural tendency to lift off the pedal as one reaches their intended speed and the resultant change in the vacuum signal received by the modulator via the increased span will keep the 3-4 shift from becoming too harsh.

Good lord, does that make any sense?

Thanks for all your help!