I am almost ashamed to tell you guys this, but I turned my truck in on lease and the MB is all I have to drive, so I had to get it right. I took the car to the dealer today. They have a mechanic who only works on the older models. He called me within an hour and said the problem with my transmission slipping and revving up before a shift was that one of the valves on top of the valve cover that the other mechanic put on was defective and leaking. There are two valves - one does affect the shift charateristics and how much vacuum goes to the modulator. This is from the dealer tech at Leith Mercedes Benz - Raleigh NC. Once replaced, my shifting should go back to normal. The reason the shift characteristics changed so drastically, was that when the other mechanic put on the new valve, he also adjusted my modulator 2 turns to soften the shifts. When the new valve went bad and threw off the vac to the modulator - WHAM! It was worse that before it was fixed. The mechanic who originally did the work will replace the part at no cost and use a factory MB part this time.

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup