I've have the same iss with mine for months. Reverse delayed until finally nothing, but it quit out after I replaced the front flex disc. The thing is, I can't reverse up a hill or even a sidewalk from a stand still, but I am able to reverse on level ground. ps2cho mentioned a B3 band which is exactly what I was told as well. Not sure about the price, my tranny has about 280k on it. If the B3 is extensive I would look into how much an overhaul would cost vs having the B3 only vs buying a rebuilt tranny and just installing it yourself

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1990 190E 3.0L