If the cruise does not work when the OD and lockup does then that is likely a cruise control only issue. I don’t recall all the requirements to achieve cruise lock, besides a Drive input from the N/S switch, trans speed signal, engine TPS, brake switch.

If OD and lockup does and so does cruise then likely you have an issue with a sensor or switch for temp. It should rule out the brake switch, N/S switch, speed sensor on the trans, the OD and lockup solenoids, engine speed input.

You still could have a wild TPS sensor showing wide fluctuation s in voltage.

Earlier you had asked about the temperature input. I’ll have to take a look at some paperwork and get back with you.