I don't recall ever replacing a governor solenoid for a no O/D, L/U condition alone. That is more likely to be a faulty reading sensor like VSS, TPS, CTS or something of that order. There are two solenoids, one each for L/U and O/D that have a single ignition hot supply wire and two separate grounds that the PCM grounds. I would look for 12 volts there before going any further.