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First I would check the wires on the end of the shift lever, under the steering column cover. Here is a link at what to look out for. The short there is known to cause electrical problems. https://www.ford-trucks.com/forums/7...uestion-3.html

Apart from that I would also check the fuse box. The super duty is known to have leaking windshields, and that usually transpires to water that drips down into the fuse box area creating all sorts of funny electrical issues. Get in under the dash area and have a look behind that fuse box for corrosion.