Required materials:
* Automatic transmission pan gasket
* Sealant for gaskets
* New O-ring for drain plug
* Brake or carburetor cleaner
* 10 mm head
* Flat head screwdriver
* Head extension (optional)
Steps:
1. Raise the vehicle and secure it. Place the car on lifts or stands.
2. Drain the oil from the automatic transmission. Locate the drain plug on the automatic transmission pan. Place an oil container under the plug and use a 10 mm socket to unscrew the plug. Let the oil drain completely.
3. Replace the drain plug O-ring. Remove the old O-ring from the plug and install the new one.
4. Clean the automatic transmission pan. Remove the pan from the transmission using a 10mm socket. Clean the pan and transmission mating surfaces with brake or carburetor cleaner.
5. Install a new gasket. Apply gasket sealant to the mating surface of the automatic transmission pan. Place the new gasket on the pan and level it.
6. Reinstall the automatic transmission pan. Install the pan onto the transmission and tighten the bolts by hand. Then use a 10mm socket to tighten the bolts in a criss-cross pattern.
7. Fill the automatic transmission with oil. Use a funnel to pour transmission oil into the automatic transmission. The amount of oil that needs to be filled depends on the car model, check the owner’s manual.
8. Install the drain plug. Reinstall the drain plug with the new O-ring and tighten it using a 10mm socket.
9. Check the oil level in the automatic transmission. Start the engine and let it idle for a few minutes. Then place the car on a flat surface and check the oil level in the automatic transmission using a dipstick. Add oil if necessary.
10. Check for leaks. Check for oil leaks around the automatic transmission pan. If leaks are found, tighten the bolts or replace the gasket.