Here's a general outline of the process. Specific steps and tools may vary slightly depending on your exact model and year. Always consult a repair manual specific to your 1999 Chevy S10 4WD Blazer for detailed instructions and torque specifications. This is crucial to avoid damage to your vehicle.
Tools You'll Likely Need:
* Jack and jack stands: Crucial for safety. Never work under a vehicle supported only by a jack.
* Wheel chocks: For added safety.
* Lug wrench: To remove the wheel.
* Socket set and wrenches: Various sizes, including metric.
* Ball joint separator: To separate the ball joint from the steering knuckle.
* Tie rod separator: To separate the tie rod end from the steering knuckle (sometimes a pickle fork can work, but a separator is preferred).
* Hammer and punch: For potentially stubborn components.
* Press (or large C-clamp): To press the old bearing out and the new one in. This is critical; trying to hammer it in or out will likely damage the bearing or hub. A shop press is ideal.
* Torque wrench: Essential for tightening bolts to the correct specifications.
* Penetrating oil (PB Blaster or similar): To loosen rusted or seized bolts.
* Wheel bearing packing grease: The correct type for your application.
* New wheel hub assembly: Order the correct part for your vehicle. These are often sold as a complete assembly, including the bearing.
General Steps (Highly Simplified – Consult a Repair Manual):
1. Safety First: Engage the parking brake, chock the rear wheels, and jack up the front of the vehicle securely on jack stands.
2. Remove the Wheel: Remove the lug nuts and take off the wheel.
3. Disconnect Components:
* Disconnect the brake caliper: Support it with wire or a bungee cord to keep it from hanging.
* Disconnect the ABS sensor (if applicable): Carefully unplug the sensor.
* Separate the ball joint: Use a ball joint separator.
* Separate the tie rod end: Use a tie rod separator.
4. Remove the Steering Knuckle: Once the ball joint and tie rod are disconnected, the steering knuckle should be able to be removed. This may require some gentle persuasion.
5. Remove the Old Hub Assembly: This is usually held in place by several bolts. Remove them and carefully remove the old hub assembly from the spindle.
6. Press Out the Old Bearing (if necessary): If the bearing is replaceable separately from the hub, this is the time to use the press to remove it. Many modern hubs come as one complete unit.
7. Install the New Hub Assembly: Using the press, carefully press the new hub assembly (or new bearing) onto the spindle. Ensure it's properly seated.
8. Reassemble: Reinstall the steering knuckle, reconnect the tie rod and ball joint, reattach the brake caliper, and reinstall the wheel. Torque all bolts to the specifications in your repair manual.
9. Lower the Vehicle: Carefully lower the vehicle and check for proper wheel alignment.
Important Considerations:
* ABS Sensor: Be careful with the ABS sensor. Damage to it can trigger ABS warning lights.
* Torque Specifications: Use a torque wrench and follow the torque specifications in your repair manual precisely. Over-tightening can damage components, while under-tightening can lead to loosening and failure.
* Wheel Alignment: After replacing the hub assembly, you will likely need a wheel alignment. Improper alignment can lead to premature tire wear and handling problems.
* Parts: Make sure you get the correct parts for your specific vehicle.
This is a simplified overview. The actual process is more complex and requires precision. Referencing a detailed repair manual specific to your vehicle is absolutely essential for a successful repair. If you're uncomfortable with any part of this process, please take your vehicle to a qualified mechanic. Improperly replacing a wheel hub bearing can lead to serious safety issues.
