The hard 1-2 shift was somewhat alleviated by replacing the vacuum valve on top of the engine. I had it done (I know...taboo on a DIY website) so I don't know if he adjusted the transmission module, however, it shifts much better now...you feel it shift but it feels good and i don't get whiplash anymore. It also used to downshift abruptly and loudy into first when slowing down, which has also disappeared with the work I had done. It only cost me $200. The valve is $72.00 at my parts store and had I known, I would have done it myself. I thought my tranny was gone so $200 didn't seem that bad at the time.

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1982 300D Turbo "Helga"
380,000 miles