tjts1 - I believe I have 1 or possibly 2 problems (possibly related) = fails to upshift, and will not allow shifter to be moved back to P unless key is removed. Also cannot select C/S. These problems are intermittent but happen too often to allow car to be used.
That being said, I am also replacing my Shifter. I also have the upshift problem (at least I think it's a 2nd problem) which is the non-upshifting issue.
I am servicing the Trans in part because I believe the fluid should be changed at least occasionally. The car has ~160K on it and the Conductor plate, Filter and plug are cheap maintenance as I hope the conductor plate service will help problem #2. I am getting a P0705 code - Transmission Range Sensor Circuit Malfunction. I'm not sure where the Speed Sensor is - there are Speed Sensors (N2 & N3) shown on the Febi diagram of the 722.6 conductor plate. It appears the Speed Sensor solenoid connect to the Starter Interlock Switch as well as the Shift Sensors Solenoid & Pressure Solenoids. I'm still learning about the Speed Sensor system.. Any help you can provide would no doubt push me along and be very much appreciated!
Larry