This transmission was a problematic transmission for Ford. The problem is a shift solenoid and or another valve malfunction in the valve body. The only way you are going to solve the problem is to place some line pressure gages on the ports that allow the taps to do so. This will tell you what is going on as far as pressures are concerned. I have rebuilt many of these transmissions. If you trailer tow a lot and the tranny has high mileage on it then it is probably had it. They are not good for many miles if you put them into hard service. Like I said a very problematic transmission. Sorry I can't help more, but I would have to have the tranny to check the options. If you take it to a tranny shop they will more than likely replace it with a rebuilt unit. Be prepared to shell out around $3800 dollars for the tranny.
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