The Automatic Gearbox on my 1982 280E has a harsh shift from 1st to 2nd, and a somewhat harsh shift from 2nd to 3rd. I've seen some articles that describe adjusting the vacuum modulator to adjust shift quality on diesel MB's. Does the same apply to the gas models? I've had a look at the gearbox, but could not identify where the modulator is located. Do I have one, and if so: where exactly is it located and how do I adjust?[?]