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If it seems to still be in overdrive when you come to a stop, the brake light switch has an electric cut out switch incorporated in it to shut off power to the trans/overdrive to kick it out of OD. If this switch is malfunctioning, it can cause this problem your having.
There is an overdrive solenoid inside the transmission that kicks the OD in and out with the switch. You could have a bad wire somewhere or solenoid is bad.
juan: there is a cable which comes from the transmission to the throttle linkage. This is called the TV (throttle valve) cable. This is designed to work in conjunction with the position of the throttle. I'm sure you heard the term "KICK DOWN SWITCH". Well this essentially is doing the same thing. If the cable is out of adjustment, it will have a tendency to want to downshift into 3rd.
Even though overdrive is electrically actuated, it can be disengaged by the throttle position.
There is also a coolant temp sensor which keeps the transmission from shifting into overdrive until the coolant temperature reaches a certain point. The sensor tells the ECM to tell the Solenoid it's ok to supply a ground to it.
Your overdrive switch provides a ground to actuate the overdrive solenoid. Make sure the switch has a solid ground serving the circuit.
The torque converter solenoid picks up it's ground from the ECM.
Both solenoids are served by the same power source which is a switched circuit through the ignition.
I hope I have shed some new light on your problem and given you some new direction in which to look. I hope I have helped you resolve your problem. If not, I'll be watching and will be ready to offer more help if needed. ..mybunkey
The throttle sensor on higher mileage vehicles has been know to cause this type concern. The voltage that the engine and trans controller sees starts to get erratic from the sensor and will kick out of OD.
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