* Input/Output Speed Sensors: These are crucial for the transmission's control system. They're usually located on the transmission itself, often near the bellhousing (where the transmission connects to the engine). One sensor measures the input shaft speed (from the engine), and the other measures the output shaft speed (to the wheels). They're often cylindrical with electrical connectors.
* Transmission Temperature Sensor: This sensor monitors the transmission fluid temperature. Its location varies but is often mounted on the transmission case or within the transmission pan.
* Reverse Switch: This isn't technically a sensor in the same way as the others, but it's a crucial switch that tells the transmission control module (TCM) when the car is in reverse. It's usually mounted on the side of the transmission case and is often a part of the transmission's shift linkage.
Finding the Sensors:
1. Consult a Repair Manual: A Haynes or Chilton repair manual specific to your 1996 Chrysler Town & Country is *essential*. These manuals have diagrams showing the exact location of all the sensors and connectors. They are worth the investment for DIY repairs.
2. Visual Inspection: Once you've located the transmission (it's a large component under the vehicle), carefully inspect the transmission case and its surroundings. Look for cylindrical sensors with wiring harnesses connected. The temperature sensor may be smaller and less obvious.
Replacing the Sensors:
This is generally a moderate-difficulty job. Always disconnect the negative battery terminal before starting any electrical work.
1. Access: You'll likely need to get under the vehicle. Jack it up safely, using jack stands for support. Consider using ramps for easier access.
2. Disconnect: Carefully disconnect the electrical connectors from the sensor. Take pictures or make notes of how the wiring is connected to avoid confusion during reassembly.
3. Remove the Sensor: Depending on the sensor's design, you may need a socket, wrench, or special tool to unscrew or unbolt it. Sometimes a sensor is simply pressed into a hole and requires gently prying or pulling it out.
4. Install New Sensor: Clean the mounting surface of any debris or old sealant. Install the new sensor, ensuring it's seated correctly. If needed, use a new gasket or sealant as specified in the repair manual.
5. Reconnect: Carefully reconnect the electrical connectors.
6. Lower Vehicle and Test: Lower the vehicle, reconnect the battery, and test-drive to ensure the replacement was successful. Error codes may appear on your dash if something is wrong. A scan tool can help diagnose any issues.
Important Considerations:
* Transmission Fluid: Replacing some sensors (like the one in the pan) might require draining some or all of the transmission fluid. Be prepared to dispose of the old fluid properly. You may also need new transmission fluid for refilling.
* Special Tools: You might need specialized sockets or wrenches for some sensors.
* Safety: Working under a vehicle is dangerous. Use jack stands and follow all safety precautions.
If you're not comfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. Improperly replacing a transmission sensor could damage the transmission.
