2005 Ford Expedition Transmission will not move in any forward gear. It will move backwards. I just replaced the transmission speed sensor. It still will not move forward.

P0705 Ford Transmission Range Sensor Out of Position

you might need a new whole transmission or new brakes or brake fluid.

Probably. There may be a solenoid not working which is keeping the transmission from engaging the forward gear train but for it not to work at all is unusual.

Hi James, The gear changes on modern vehicles is often controlled by speed sensors mounted onto each wheel. The sensors also control the ABS, traction control and activate the speedo. Have a diagnostic scan carried out and determine if the sensors are all in working condition. Regards John

Replace transmission range sensor.

Some speed sensors will help the transmission know when to switch gears, but with some of the things you describe, sounds like after driving it that long, damage to the transmission has occured. Also, it could be a bad torque converter. There is also something called the transmission torque converter clutch solenoid, causes the car to buck and cut off. Hope this helps, any questions just contact me.

it sounds like something broke inside the transmission

the flashing O/D light usually means you have a bad speed sensor that sends speed info to the engine & trans computer.

Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 42) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.
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Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 42) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.

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Some trans use an OSS, Output Shaft Sensor instead of a VSS. Depends on which trans you have, 4R100 or 4R70W

Transmission Control Switch (TCS) and Transmission Control Indicator Lamp (TCIL)
The transmission control switch (TCS) is a momentary contact switch. When the switch is pressed, a signal is sent to the powertrain control module (PCM) to allow automatic shifts from first through fourth gears or first through third gears only. The PCM energizes the transmission control indicator lamp (TCIL) when the switch is off.

The TCIL indicates overdrive cancel mode activated (lamp on) and electronic pressure control (EPC) circuit shorted (lamp flashing) or monitored sensor failure.

Output Shaft Speed (OSS) Sensor
The output shaft speed (OSS) sensor is a magnetic pickup, located at the output shaft ring gear, that sends a signal to the powertrain control module (PCM) to indicate transmission output shaft speed. The OSS is used for torque converter clutch control, shift scheduling and to determine electronic pressure control.

U will need to replace the power seat transmission, the gears are most likely stripped out, not uncommon, this part is $800 so i would suggest u try to locate a used one.