Continuing this month with the information provided by Jim Dial on the U-series 140/240 transmission we cover some common wear-out areas in the valve body that can cause this unit to fail again prematurely. The best thing about this is that they are all sleeves and are easily repaired. These items were discovered as the U140/U240 Technicians Diagnostic Guide was being written.
In past articles and bulletins we have talked about functions of the torque-converter-clutch (TCC) solenoid on the 4L30-E family and how on BMW and 2000-up Isuzu models this solenoid is responsible for TCC application and a reverse-inhibit solenoid. The U140/240 series has “one-upped” that, as we are going to find out in the following illustrations.