This is a general overview; specifics may vary slightly depending on your Blazer's exact model and axle type (8.5" 10-bolt is common but not guaranteed). Always consult a repair manual specific to your year and model Blazer for precise instructions and torque specifications.
Tools you will likely need (this is not exhaustive):
* Jack and jack stands: Securely support the vehicle.
* Wheel chocks: Prevent accidental movement.
* Lug wrench: Remove the wheels.
* Impact wrench (highly recommended): Makes removing axle nuts significantly easier.
* Socket set and wrenches: Various sizes will be needed.
* Brake caliper compression tool: To retract the brake caliper pistons.
* Bearing race and seal installer/remover tools: Essential for proper installation without damaging the bearings or housing. These are specialized tools and usually come as a set.
* Torque wrench: Crucial for tightening components to the manufacturer's specifications.
* Penetrating oil (PB Blaster, etc.): To loosen rusted or seized bolts.
* Clean rags and shop towels: To keep things clean.
* New bearings, seals, and any other replacement parts: Get OEM or high-quality replacements.
General Steps (Again, consult your repair manual for detailed instructions):
1. Safety First: Disconnect the negative battery terminal. Secure the vehicle on jack stands. Use wheel chocks.
2. Remove the Wheel and Brake Components: Remove the wheel, then carefully remove the brake caliper (compress the pistons first to allow caliper removal), brake rotor, and axle nut. Use the impact wrench if you have one for the axle nut.
3. Remove the Axle Shaft: This often requires removing the cotter pin and castle nut, then carefully tapping or sliding out the axle shaft.
4. Remove the old Bearing(s) and Seal(s): This is where specialized tools are crucial. Improper removal can damage the axle housing. Use the bearing race and seal remover tools.
5. Inspect the Axle Housing and Differential: Check for any damage or excessive wear.
6. Install the New Bearings and Seals: Use the bearing race and seal installer tools to press in the new bearings and seals. Ensure proper seating and alignment.
7. Reassemble: Reverse the steps of disassembly. Pay close attention to the correct installation of the axle shaft, ensuring it is properly seated in the differential.
8. Torque Specifications: Use your torque wrench to tighten all components to the manufacturer's specified torque settings. This is critical for proper function and longevity.
9. Refill Differential Fluid (if necessary): Check the differential fluid level and add more if needed. Use the correct type of gear oil specified for your Blazer.
10. Test Drive: After reassembly, carefully test drive the vehicle at various speeds and driving conditions to verify the repair. Listen for any unusual noises.
Important Considerations:
* Axle Housing Damage: If the axle housing is damaged, it might need to be replaced or repaired.
* Differential Problems: Rear end bearing failure could be a symptom of a larger problem with the differential. Have a mechanic inspect the differential if you suspect issues.
* Preload Adjustment: Some rear ends require adjusting the bearing preload. This is a critical step and requires specific tools and knowledge.
This is a complex procedure. Refer to a repair manual specific to your 2000 Chevy Blazer. A Haynes or Chilton manual is a good investment for DIY auto repair. If you're unsure about any step, it's always best to consult a qualified mechanic. Improperly installed bearings can lead to catastrophic failure, potentially resulting in an accident.
