With a warm transmission, it will not upshift at all after coming to a complete stop. Transmission remains in first gear and also begins to slip. Stopping the car and shutting off the engine and restarting will fix the problem the majority of the time. The fluid and filter was just changed (Valvoline Dextron III) and is serviced to correct level. If transmission is cold it works fine. Any help would be appreciated as I am not looking foward to a big repair bill.
84 928S 4speed Auto
Two most likely causes are the governor or the valve body. Either can be pulled and cleaned without removing the transmission from the car. I would try cleaning and checking the governor first, as it is an easier task.
You will probably need the manuals to do either.
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