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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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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