Hello Joe,
I too share your problem. No rear wheel drive
What a bummer.
Got not trouble lights? I have none either.
Check the transfer pressure? Be there in person when your tranny person does it. It is the plug on the side near the top of the transfer housing on the driver side. It is 10mm(1.0) {Corrected 10-26-001} with an o-ring seal. A 1/8"NPT pipe nipple will grab a few threads. There should be pressure there when the car is running and the trans is in R or D.
My car has no pressure there. I have concluded the transfer valve is stuck. This is really a pilot valve that works the transfer valve and the solenoid is in between. Any one of these items could be stuck: pilot, transfer or solenoid. There are no warning lights if these stick. The only way to check is measure the pressure at that port. The maual has spec's for the proper values.
The question is...... Why does it stick? It could be worn out because it is always in motion or is it just gummed up? I would like to know if you find out.
Is your TPS original? Have you had a TPS code from the ECU? How many miles on the car?
This info would be helpful.