The trans command can easily be tested by bypassing it. Unplug both plugs and replug the truck harness into the trans harness. My 92 f350 was acting like this and it was the shift switch on the transmission
I have a very worn out zf5, recently put syncros and bearings in it, it will not shift properly at all with mercon v only in it. It works reasonably well with 25% Lucas and mercon v.
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