Here's a general overview of the process. Specific steps may vary slightly depending on which driveshaft (front or rear) you're working on and the specific model of your Cherokee. Always consult a repair manual specific to your 1989 Jeep Cherokee for detailed instructions and torque specifications.
Tools You'll Need:
* Socket set: Including metric and possibly SAE sockets.
* Wrench set: Combination wrenches are helpful.
* Hammer: A ball-peen hammer is ideal.
* Pry bar: To help separate the U-joint from the yoke.
* U-joint press (recommended): Makes the job much easier and reduces the risk of damage. A vise and sockets can be substituted, but it's more challenging.
* Grease: For the new U-joint.
* Torque wrench: Essential for tightening bolts to the correct specifications.
* Jack and jack stands: To safely support the vehicle.
* Wheel chocks: For safety.
* Penetrating oil (PB Blaster or similar): To help loosen rusted bolts.
General Steps (Consult your repair manual for specifics):
1. Safety First: Secure the vehicle with jack stands and wheel chocks. Disconnect the negative battery terminal.
2. Locate the U-joint: Identify the driveshaft with the bad U-joint. You may need to inspect both the front and rear driveshafts.
3. Support the Driveshaft: Securely support the driveshaft to prevent it from falling or moving unexpectedly.
4. Remove the Driveshaft (if necessary): Depending on the location of the bad U-joint, you may need to remove the entire driveshaft. This typically involves removing bolts at the differential and transfer case (or transmission).
5. Remove the U-joint Caps: Use a hammer and punch (or a special U-joint separator tool) to carefully drive out the retaining clips. These are usually held in place by a small snap ring or cotter pin. Apply penetrating oil if necessary.
6. Press Out the Old U-joint: This is where a U-joint press is invaluable. If you don't have one, you can carefully use a vise and sockets to press the old U-joint out. This is delicate work and requires patience to avoid damage.
7. Install the New U-joint: Using the press (or vise method), carefully install the new U-joint into the yoke. Make sure it's seated correctly.
8. Reinstall the U-joint Caps: Carefully install the retaining clips, ensuring they snap into place.
9. Reinstall the Driveshaft (if removed): If you removed the driveshaft, reinstall it, ensuring it's properly aligned.
10. Torque to Specifications: Tighten all bolts to the torque specifications listed in your repair manual. This is crucial to prevent premature failure.
11. Lower the Vehicle: Carefully lower the vehicle from the jack stands.
12. Test Drive: Test drive the vehicle to ensure the repair was successful. Listen for any unusual noises or vibrations.
Important Considerations:
* Grease: Pack the new U-joint with grease before installation.
* Alignment: Proper alignment is critical. Misalignment can cause premature wear and failure.
* Torque Specifications: Always follow the torque specifications from your repair manual. Using the wrong torque can damage the parts.
* Repair Manual: A repair manual specific to your 1989 Jeep Cherokee is absolutely essential. It will provide detailed instructions, diagrams, and torque specifications.
This is a simplified overview. Again, consulting a repair manual is absolutely crucial before attempting this repair. If you're not comfortable with these steps, it's best to have a qualified mechanic perform the work. Improper installation can lead to serious damage to your vehicle.
