I have a 94 E-420 that has recently begun to have irrattic shifting problems. The shifts are unusually hard at times and at other times it flares between gears. The symtoms seem to have come on ratherly quickly. I have checked the vacuum lines as best I can, no problem there. I seems to me to be a vacuum modulator type of symptom. Any ideas before I take it in to a shop? I'm afraid that a shop will tell me it needs a tranny overhaul when it may be something minor. The car has about 106000 miles and has been the best auto I have ever owned. If the tranny is going out I may trade the car off since an overhaul is sooo expensive.