However, if you are determined to proceed yourself, here's a general outline of the process. Remember, this is a simplified overview and does not cover every detail. Consult a factory service manual specific to your vehicle's transmission (likely a 4T65-E) for detailed instructions, torque specifications, and diagrams.
1. Preparation:
* Safety First: Disconnect the negative battery terminal. Wear safety glasses and gloves.
* Gather Tools and Supplies: You'll need a transmission jack or hoist, various sockets and wrenches (metric), a torque wrench, transmission fluid (the correct type for your transmission), a drain pan, shop rags, possibly a pressure tester for the transmission, and of course, the replacement solenoid(s).
* Obtain a Service Manual: This is crucial. It provides detailed steps, torque specifications, and diagrams specific to your vehicle's transmission.
2. Accessing the Transmission:
* Raise and Support the Vehicle: Securely lift the Grand Prix and support it on jack stands. Never work under a vehicle supported only by a jack.
* Drain the Transmission Fluid: Locate the transmission fluid pan and drain the fluid into a suitable container.
* Remove the Transmission Pan: Remove the transmission pan bolts. Be prepared for fluid spillage.
* Disconnect Components: Disconnect various components connected to the transmission, including the shift linkage, electrical connectors, and cooling lines. Take photos or make notes as you disconnect to help with reassembly.
3. Removing the Valve Body:
* Locate the Valve Body: The valve body is typically located on the side or bottom of the transmission.
* Remove Valve Body Bolts: Carefully remove the bolts securing the valve body to the transmission case. Again, take photos or notes on the bolt locations and orientations.
* Remove the Valve Body: Gently remove the valve body. It might be necessary to use a pry bar (carefully!) to break the seal.
* Inspect the Valve Body: Inspect the valve body for any damage or debris.
4. Replacing the Solenoid(s):
* Locate the Faulty Solenoid(s): Identify the specific solenoid(s) that need replacement.
* Remove the Solenoid(s): Carefully remove the old solenoid(s) using the appropriate tools. Often, they simply pull out or may require a special tool.
* Install the New Solenoid(s): Install the new solenoids, ensuring they are seated correctly.
5. Reassembly:
* Reinstall the Valve Body: Carefully reinstall the valve body, ensuring a proper seal.
* Reconnect Components: Reconnect all components that were disconnected earlier.
* Reinstall the Transmission Pan: Reinstall the transmission pan with a new gasket.
* Refill the Transmission Fluid: Add the correct amount of transmission fluid. Refer to your service manual for the exact amount.
6. Testing and Final Steps:
* Start the Engine: Start the engine and check for leaks.
* Check Transmission Function: Test the transmission function thoroughly.
* Check Fluid Level: Check the transmission fluid level and top off if necessary.
Disclaimer: This is a highly simplified overview. Incorrectly performing any of these steps can lead to significant transmission damage. The complexity of this repair necessitates professional help unless you possess substantial automotive experience and the necessary tools and equipment. Using the incorrect transmission fluid can also cause significant damage. Always consult a factory service manual for your specific vehicle.
