My SD is shifting hard. The trany shop replace a couple of small vacuum switches in the engine compartment (and popped me $125 for two 5 dollar valves) they also said to replace the vacuum switch on the trany. I got the correct color switch from a parts house. There was a paper in the box that said "Attention! To prevent gearbox or engine damage the vacuum unit must be adjusted as explained in Workshop Manual before vehicle is driven"

Of course I don't have a Workshop Manual. I cannot see anything to adjust either. Any tips?