Greetings,
I have a 300D that has sort of soft shifts. They're not super soft, or really sloppy (although it slips sometimes going from 2nd to 3rd when I don't accelerate hard) but I'd like them to be just a bit harder. Is there a way to do this? Do I have to alter the vacuum going to the transmission? By the way, I do have a very slight vacuum leak somewhere as the locks don't work in very cold weather. I suspect when it's cold out, the vacuum lines harden and the leak gets a little worse. When it's atleast 35 or 40 degrees out, the locks work fine and seem to hold vacuum overnight. Thanks a lot for the info. I think slightly harder shifts would give me a bit more confidence when I drive this otherwise marvelous car.

Alex

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1983 300D (parked for four years)
2012 VW Sportwagen TDI Manual
2001 Miata SE
1962 Chevrolet Corvair Rampside