My wifes 81 SD won`t shift out of 1st or 2nd what ever gear it is that it starts out in it won`t up shift. I`ve disconected the shift down switch, still won`t shift. I`ve done a search and not finding anything other than shift down switch. I`ve replaced a B-2 piston on another car but it would shift up but would slip in the lower gears . I`ve checked the fluid it`s fine .Wife says it`s happened before and she would pull over and stop and then take off again and then it would shift. She said it has done this a couple of times . Anyone have this problem before or have any idea`s ? Thank`s Rick

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81 240D 116,000 mi. motor, car 283,000 81 300D 155,000 81 300 unknown 81 300SD 221,000