Hello, I am John, a Ford dealer technician.
I hope I can help solve your problem quickly and accurately.
This is a common problem on these trucks and is pretty easy to repair. This is caused by a bad solenoid pack in the transmission. This part is located inside the pan. I will post instuctions on how to replace it. You will need a pressure filler in order to fill this transmission. If you don't have one you may have to take it to a mechanic to get it filled. Hope this helps.
Click here for instructions.
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Very few problems with the valve bodies on these. Replaced MANY solenoid packs! The part number is
Hope this helps!