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Hi Ozzy Oz,
Welp, New Jersey is a snow and salty rusty belt and Florida is a humid heck hole, and both contribute to gremlins in ageing electronics like that in your 960/90.
It is mythos to believe that clearing codes will mend the cause. Though clearing codes may make the controlling computer act as if no fault exist, until the ECU (electronic control unit) encounters the fault again. At any point along the circuit, there may be a fault, and it may require comprehensive visual connection.
Yet you may get away with investing the connection points along the circuit path. So, any connector from the sensor to the ECU. That may mean with battery disconnected, removing, inspecting, and restoring ECU connectors.
Wires can flex such that the stranded copper alloy conductor can break along a free to move cable arc, causing an open circuit - a discontinuity. Moving the wheels may not cause the condition for discontinuity. As you drive your vehicle, suspension-driveline articulation and movement vibration may cause the issue.
I am not intimate with the later wire harness routing and securing points on your model year 960. My familiarity ends at about 1995 940.
Though the speedo works fine, you say. Without fault. So, it may be time to pull the assembly oh so very carefully from the dash, and check the works there. Vehicle Speed Sensor / rear axle speed sensor signal goes through the speedometer itself and then to the ECUs. So, you have have fault between there and the reporting ECUs it would appear.
From the speedo outward to the ECUs. The connectors, or, inside the dash assembly. There exist, by model and year on 240, and Spook and others would no better for at least 940, the speedo assembly varies, and comes with problems that age reveals. Also, electronic components like capacitors. Vibration can cause factory solder welds along the circuit path to fracture. Corrosion can cause bonded connection to corrode.
As for the WSE switch, please see:
https://www.brickboard.com/FAQ/700-900/TransmissionAutoAW30.htm
I hope the TCM you have purchased is not expensive. Though these can fail. The cause may be varied. Replacement WSE switch could be faulty. The contacts inside the switch can get gunked up or carbon pitted, even though these are low current switches. Though your problem may requiore more comprehensive diagnosis.
Please see:
http://volvoforums.com/forum/volvo-260-760-960-28/1992-volvo-960-serious-transmission-issue-86992/
I'm unsure how I can help remotely further. More research using your favorite search engine using choice keywords can further help you.
Questions?
I hope that helps.
Thanks,
Catholic Thrift Store Clothing Scabies Infested MacDuff.
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