Is there a delay in shifting and then a hard shift? That is usually cuased by a bad vacume modulator on the transmission. I just dropped my 90 300e off to have the transmission rebuilt yesterday. My problems were typical for this transmission, no reverse and hard/delayed shifts. My temp guage sits at the line above 80. But hey the car has 184K mi on it.

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97' SL600 Sport Pano - Silver
90' 300e 2.6 - Silver Donated to a family member
95' C280 - Artic White
88' 924s - Guards Red Sold
98' Durango SLT - Silver
93' 740i Tripple Black Sold
95' 900s Conv - Red
96' XJ6 - Black - For Sale
95' 325i Convertible - Montreal Blue My Project Car