Here's a breakdown of how to perform a partial transmission fluid change, the safer and recommended approach for most DIYers:
Tools and Materials:
* New ATF (Automatic Transmission Fluid): Use the type specified in your owner's manual. Dexron III is a common choice for this year, but *always double-check your manual.*
* Transmission drain pan: Large enough to hold the fluid being drained.
* Wrench(es): The size needed to remove the drain plug on the transmission pan. (likely a 10mm, 13mm or 1/2" depending on the transmission)
* Socket wrench and extensions: May be necessary to reach the drain plug.
* New transmission pan gasket: Essential to prevent leaks.
* Funnel: For adding new fluid.
* Jack and jack stands: Crucial for safety. *Never work under a vehicle supported only by a jack.*
* Wheel chocks: To secure the vehicle.
* Torque wrench: To tighten the drain plug and pan bolts to the correct specification (found in your owner's manual).
* Gloves: To protect your hands.
* Rags or shop towels: To clean up spills.
* Measuring container (graduated cylinder is best): To accurately measure the drained fluid. This helps you determine how much to replace.
Procedure:
1. Safety First: Park the Jeep on a level surface, engage the parking brake, and chock the wheels. Raise the vehicle using a jack and secure it on jack stands. Remember to consult your owner's manual for jacking points.
2. Locate the Transmission Pan: The transmission pan is located on the bottom of the transmission. It's usually a fairly large, rectangular pan.
3. Drain the Fluid: Carefully position the drain pan under the transmission pan. Remove the drain plug using the correct wrench. Let the fluid drain completely. Note the amount that drains out.
4. Remove the Transmission Pan: Once the fluid has drained, carefully remove the transmission pan bolts. The pan will likely be heavy and contain some residual fluid, so be prepared for that.
5. Inspect the Pan and Filter (if applicable): Inspect the pan for any signs of damage, debris, or unusual wear. Some transmissions have a filter inside the pan; if yours does, replace it with a new one. Clean the pan thoroughly if needed.
6. Replace the Pan Gasket: Install the new transmission pan gasket according to the manufacturer's instructions.
7. Reinstall the Pan: Carefully reinstall the transmission pan and tighten the bolts to the manufacturer's specified torque using your torque wrench.
8. Refill with New Fluid: Add the same amount of new ATF that drained from the transmission. Use a funnel to pour the new fluid into the transmission dipstick tube (if your transmission has one. Some require filling via a specific port). *Your owner's manual will give the correct capacity, but typically you will only drain about 4-6 quarts through this method.*
9. Check the Fluid Level: Consult your owner's manual for the correct procedure to check the transmission fluid level. This often involves running the engine to operating temperature, then checking the level with the engine running.
10. Lower the Vehicle: Carefully lower the Jeep from the jack stands.
11. Drive and Re-check: Drive the Jeep for a short distance to circulate the new fluid. Re-check the fluid level and add more if necessary.
Important Considerations:
* Multiple Partial Changes: For a more thorough fluid change, repeat this process several times over a period of days or weeks. This gradually replaces a larger percentage of the old fluid.
* Professional Service: If you're uncomfortable performing this task yourself, take your Jeep to a qualified mechanic. Improper transmission fluid changes can cause significant damage to your transmission.
* Owner's Manual: Always consult your owner's manual for specific instructions and torque specifications. This guide is a general overview, and specifics vary by vehicle.
This process only replaces a portion of the fluid. For a more complete fluid exchange, a power flush is recommended but should only be performed by a professional with the proper equipment. A power flush carries the risk of dislodging debris and damaging the transmission if done incorrectly. Therefore, the multiple partial drain and fill method is preferred for DIY mechanics.
