Here's a general overview of the process. Remember this is NOT a substitute for a proper repair manual:
Tools You'll Likely Need:
* Jack and jack stands: Safety first! Secure the vehicle properly.
* Wheel chocks: Essential for added safety.
* Lug wrench: To remove the wheel.
* Torque wrench: Crucial for proper tightening of bolts.
* Socket set and wrenches: Various sizes will be needed.
* Pry bar or similar tool: May be needed to separate components.
* Penetrating oil (PB Blaster, etc.): To loosen rusted or seized bolts.
* Hammer: Possibly needed to help seat components.
* New half shaft: Make sure you get the correct one for your vehicle.
* Transmission jack (recommended): Makes supporting the transmission much easier and safer.
* Possibly a CV joint boot kit: Depending on the condition of the existing boot.
General Steps (Consult your repair manual for specifics):
1. Safety First: Disconnect the battery negative terminal. Raise and securely support the vehicle on jack stands. Engage the parking brake and use wheel chocks.
2. Remove the Wheel: Remove the wheel on the side of the faulty half shaft.
3. Disconnect the Half Shaft: This is where the complexity begins. You'll likely need to:
* Disconnect the ABS sensor (if applicable): Carefully unplug the sensor connector.
* Disconnect the speed sensor (if applicable): Similar to the ABS sensor.
* Remove the axle nut: This will often require a large socket and potentially a breaker bar.
* Separate the inner CV joint from the transmission: This often requires carefully prying or using a special tool. The transmission may need support to prevent damage.
* Remove the outer CV joint from the hub: This might involve removing the hub itself depending on your specific model.
4. Remove the Half Shaft: Once the inner and outer CV joints are disconnected, the half shaft should be able to be removed.
5. Install the New Half Shaft: This is the reverse of the removal process. Pay close attention to the orientation of the CV joints and ensure they seat properly.
6. Reconnect Everything: Reconnect the ABS sensor, speed sensor, axle nut (torque to specifications!), and wheel.
7. Lower the Vehicle: Carefully lower the vehicle from the jack stands.
8. Test Drive: Test drive the vehicle to ensure everything is working correctly.
Important Considerations:
* CV Boot Condition: Inspect the CV boot on the new half shaft. If damaged, replace it to prevent grease leakage and premature failure.
* Torque Specifications: Absolutely crucial to use a torque wrench and follow the torque specifications in your repair manual. Incorrect torque can lead to damage or failure.
* Wheel Alignment: After replacing a half shaft, it's a good idea to get a wheel alignment to ensure proper tire wear and handling.
* Difficulty: This is not a beginner-level repair. If you are not comfortable with automotive repair, it's best to take your vehicle to a qualified mechanic.
This is a simplified overview. Do not attempt this repair without a detailed repair manual specific to your 2004 Ford Focus. Improper installation can lead to serious damage to your vehicle and potentially injury. If you're unsure about any step, consult a professional mechanic.
