Had same sort of problem with my 94 F350 460 and at. Was so bad truck was running in limp home mode. Made towing trailer a horrid experience. Finally, got checking and solenoid failure was problem. The solder joints of the solenoids to the board were cold solder, ie not really bonded 100%,which had deteriorated to zero %. There is one positive feed in to all 5 solenoids, thru each, then back to main computer for processing to ground-or no ground. I got the wiring harness from a donor truck so I can plug in and check without pulling the pan. I fixed mine in about 10 minutes, put wire to connect as well as solder to trace o board. Has NOT missed a shift or been in the wrong gear at the wrong time, up hill down hill, loaded trailer or just truck since. Mileage and performance greatly improved. Now it is a nice truck to drive. Most of the time I am not aware of shifts occurring. Notice in the most right hand of the group of 5 pins, that is unsoldered. That is trouble. This pix shows the hard wire I added. There is another circuit in the connector that is temp sense IIRC.
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