Tools You'll Need:
* Jack and jack stands (Crucial for safety!)
* Transmission jack (highly recommended, makes the job significantly easier)
* Socket wrench set (metric)
* Drain pan
* Torque wrench
* Ratchet and extensions
* Pliers or a small pry bar (may be needed)
* Gloves
* Shop rags or paper towels
* New transmission pan gasket (absolutely necessary)
Procedure (for an automatic transmission – AW4):
1. Safety First: Securely jack up the Jeep and place it on jack stands. Never work under a vehicle supported only by a jack.
2. Locate the Transmission Pan: The pan is located on the bottom of the transmission, typically toward the front.
3. Drain the Transmission Fluid: Locate the drain plug on the transmission pan. Place your drain pan underneath and carefully loosen and remove the drain plug. Let the fluid drain completely. This can take some time. Be prepared for hot fluid – let it cool if needed.
4. Remove the Transmission Pan: You'll likely need a socket to remove the pan bolts. These are usually located around the perimeter of the pan. Start by loosening them slightly, then carefully remove them one by one, keeping track of their location and order if possible. The pan may be slightly stuck due to old gasket material. Gently pry it away with a pry bar, working your way around the perimeter. Be careful not to damage the pan or surrounding components.
5. Clean the Pan and Transmission: Once the pan is removed, clean any old gasket material from both the pan and the transmission mating surface. Use a gasket scraper, putty knife, or a wire brush to remove all traces of the old gasket. Make sure the surfaces are clean and free of debris.
6. Install the New Gasket: Apply a thin, even bead of new transmission gasket sealant (if recommended by the gasket manufacturer – follow their instructions) to the new transmission pan gasket. Carefully position the new gasket onto the transmission.
7. Install the Transmission Pan: Carefully position the transmission pan over the gasket and align the bolt holes. Install the pan bolts, hand tightening them until snug. Do not overtighten them at this point.
8. Tighten the Bolts: Using a torque wrench, tighten the bolts to the manufacturer's specified torque. This is crucial to prevent leaks. Consult a repair manual for the correct torque specifications.
9. Refill the Transmission Fluid: Once the pan is securely tightened, refill the transmission with the correct type and amount of transmission fluid. Consult your owner's manual or a repair manual for the proper fluid type and capacity. Check the fluid level using the dipstick.
10. Lower the Vehicle: Carefully lower the Jeep from the jack stands.
11. Check for Leaks: Start the engine and let it run for a few minutes. Check carefully for any leaks around the transmission pan.
Important Considerations:
* Manual Transmission (AX-15): The process is similar but simpler. There's no fluid to drain beforehand (unless you're also replacing the clutch). The pan will likely just be bolted on.
* Repair Manual: A repair manual specific to your 1994 Jeep Cherokee is highly recommended. It will provide detailed instructions, torque specifications, and diagrams.
* Transmission Fluid: Use only the recommended transmission fluid for your Jeep's transmission. Using the wrong fluid can severely damage the transmission.
This process is more complex than it might seem. If you are not comfortable working on your vehicle, it's best to take it to a qualified mechanic. Improperly performing this task could lead to transmission damage.
