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Probably the speed sensor on the transmission. It would cause both problems. You should also have a check engine light with a trouble code for the sensor.
EASY ONE.... Your VSS (Vehicle SPEED SENSOR) stopped working and it is this Sensor that gives the PCM/ECM the information to change gears. Once you change your VSS, and get it working, the Transmission will start working again...
I am Assuming that the Transmission stopped working at the same time the Speedometer did? Is that right?
If it is, then this is a easy fix. 1 bolt and one Wire Connector and DONE....
This transmission is electronically shifted via solenoids controlled by a computer, so you need to have that tested for fault codes that may be in memory.
I had the same problem with my 2002 Grand Caravan. It turned out to be a broken wire attached to the speed sensor on the transmission housing. Try that first!
Fourth gear in your vehicle doesn't exist. What feels like a fourth gear is the torque converter locking up. The lockup lockup is controlled by a solenoid in the side pan of the transmission, and the solenoid is controlled by the ECM (electronic control module) in response to several pressure, temperature and speed sensors etc. To determine which component is the problem you'll need a professional transmission mechanic with the proper diagnostic equipment.
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