Here's a general overview of the process. This is not a substitute for a proper repair manual. Variations exist depending on the specific rear suspension design (some Impalas had different configurations).
Tools You'll Likely Need:
* Jack and jack stands: Absolutely essential for safety. Never work under a car supported only by a jack.
* Wheel chocks: To secure the other wheels.
* Lug wrench: To remove the wheels.
* Torque wrench: Crucial for tightening bolts to the correct specification.
* Hammer and punch: For removing and installing components.
* Socket set and wrenches: Various sizes will be needed.
* Bearing packing grease: Use the correct type specified in your repair manual.
* Penetrating oil: To help loosen rusted or seized bolts.
* Pry bar: May be needed to separate components.
* Clean rags: To keep things clean.
* New rear wheel bearings and seals: Get the correct parts for your specific Impala model.
General Steps (Again, consult your repair manual for precise instructions):
1. Safety First: Park on a level surface, engage the parking brake, and use wheel chocks on the wheels that remain on the ground.
2. Remove the Wheel: Loosen the lug nuts before jacking up the car. Jack up the car and secure it on jack stands. Remove the wheel.
3. Remove the Brake Caliper and Rotor: Detach the brake caliper (support it with a wire or clamp to prevent stress on the brake line). Remove the rotor. Some models may require removing the backing plate.
4. Remove the Axle Nut and Axle Flange: This is often a large nut requiring significant torque to remove. Use a breaker bar if necessary.
5. Remove the Axle Shaft: This may require separating components of the suspension and possibly using a slide hammer. This is where having a repair manual becomes critical.
6. Remove the Old Bearing: This step varies greatly depending on your Impala's design. Some bearings are pressed in and require a bearing separator or press. Others might involve removing a hub assembly.
7. Clean and Inspect: Thoroughly clean the hub and housing. Inspect the area for any damage.
8. Install the New Bearing: This will involve pressing in the new bearing (likely with a press). Again, the repair manual will be essential.
9. Reassemble: Carefully reassemble all components in the reverse order of removal, ensuring everything is properly seated and lubricated with the correct grease. Pay close attention to the torque specifications for all bolts.
10. Torque Specifications: Use your torque wrench to tighten all bolts to the manufacturer's specifications. Incorrect torque can damage parts and compromise safety.
11. Test: Lower the vehicle, install the wheel, and test drive the car, paying attention to any unusual noises or vibrations.
Important Considerations:
* ABS Sensors: If your Impala has ABS (Anti-lock Braking System), be careful not to damage the ABS sensor during the process.
* Rear Suspension Variations: There are variations in the rear suspension design between 2007 Impala models. Your repair manual will show you the specific details for your car.
* Professional Help: If you're not comfortable with this type of repair, it's best to take your car to a qualified mechanic. Incorrectly installing wheel bearings can lead to dangerous consequences.
This is a simplified overview. Always consult a repair manual specific to your 2007 Chevrolet Impala before attempting this repair. The repair manual will provide detailed step-by-step instructions, torque specifications, and diagrams necessary for a successful and safe repair.
