Here's a general overview of the process. This is NOT a substitute for a proper repair manual.
1. Safety First:
* Disconnect the negative battery terminal. This prevents electrical shorts and injury.
* Work in a well-ventilated area. Transmission fluid is messy and can be harmful.
* Use jack stands. Never work under a car supported only by a jack.
* Wear safety glasses and gloves. Transmission fluid is hazardous.
2. Preparation:
* Gather tools: You'll need various sockets, wrenches, a transmission pan, a drain pan, a torque wrench, new transmission fluid (the correct type for your Impala), and potentially a solenoid removal tool.
* Locate the transmission: It's usually located beneath the vehicle, connected to the engine.
* Identify the specific solenoid: Consult your repair manual to pinpoint the location of the faulty solenoid on your transmission.
3. Accessing the Solenoid:
* Drain the transmission fluid: Locate the transmission pan and carefully drain the fluid into a suitable container. This is messy, so be prepared.
* Remove the transmission pan: This typically involves removing several bolts securing it to the transmission. Have a drain pan underneath to catch any remaining fluid. Inspect the pan for debris or metal shavings – this can indicate further transmission problems. Replace the pan gasket.
* Locate the solenoid: Once the pan is removed, you'll have access to the solenoids. They're usually electrically connected and may require careful removal.
4. Solenoid Replacement:
* Disconnect the electrical connector: Carefully unplug the electrical connector from the faulty solenoid.
* Remove the solenoid: This may require a special tool or careful prying, depending on the design. Avoid damaging the solenoid's housing or the surrounding components.
* Install the new solenoid: Carefully install the new solenoid, ensuring it's seated correctly.
* Reconnect the electrical connector: Make sure the connector is securely plugged in.
5. Reassembly:
* Reinstall the transmission pan: Replace the pan gasket and carefully tighten the bolts to the manufacturer's specified torque.
* Refill the transmission with the correct fluid: Check your owner's manual or repair manual for the correct type and quantity of transmission fluid.
* Reconnect the battery: Reconnect the negative battery terminal.
* Check for leaks: Inspect for leaks around the pan and the solenoid connections.
6. Testing:
* Start the engine: Let the engine run for a few minutes, checking for any leaks or unusual noises.
* Test drive the vehicle: Drive the vehicle to check for improved shifting performance.
Again, this is a simplified overview. Improper replacement can cause significant damage to your transmission. Use a repair manual specific to your vehicle's year, make, and model, and if you're not comfortable performing this repair yourself, take it to a qualified mechanic. The cost of a professional repair will likely be less than the cost of a damaged transmission.
