On my 1987 300D, shifts are too hard at low RPMs and too soft when more power is being applied. What seems to be happening is that the vacuum is too low during gentle driving but too much when power is applied. I get 10" Hg vacuum at the TRA port on the blue vac transducer (disc shaped device near alarm horn on driver's side fender), but the vacuum does not change when I rev the engine. What is inside the riveted-shut vacuum transducer? Another @(*#*(*! rubber diaphragm?





Thank you!