The pin in question was E5. Range switch C. I need a better proofreader. :(

On the '7747 to '427 PCM conversions I've done, I covered the P/N wire with heat shrink tubing and zipped tied the P/N wire to the harness.
That matches the manual trans wiring diagrams.

Those diagrams also show two signals from the DRAC. One is VSS and one is trans speed. The "possible symptom" for a faulty trans speed signal on F13 is "fuel cut." I have a 4k ppm VSS signal to supply. I do not have a 40 pulse/revolution trans speed signal.