This is a general overview, and specifics might vary slightly depending on your exact axle configuration (Dana 44, 8.5-inch 10-bolt, etc.). Always consult a repair manual specific to your truck's year, model, and axle type for detailed instructions and torque specifications.
Tools You'll Likely Need:
* Wheel chocks: Essential for safety.
* Jack and jack stands: Securely support the truck.
* Lug wrench: To remove the wheels.
* Socket set and wrenches: Various sizes will be needed.
* Pry bar or punch: To help separate components.
* Hammer: For carefully driving components.
* Penetrating oil (PB Blaster or similar): To loosen rusted bolts.
* New axle seal: Get the correct part number for your axle.
* Seal driver: To install the new seal without damaging it. (Highly recommended)
* Torque wrench: Absolutely crucial for proper tightening.
* Clean rags or shop towels: To keep things clean.
* Grease: For lubricating new seals and components.
* Possibly a bearing puller: Depending on the condition of the axle seals and bearings.
General Steps (This is NOT a complete guide, consult a repair manual):
1. Safety First: Chock the rear wheels, engage the parking brake, and securely lift the front of the truck using jack stands.
2. Remove the Wheel and Hub Assembly: Remove the wheel and brake caliper. You may need to disconnect the brake line if necessary (be prepared to catch any brake fluid). Next, remove the hub assembly. This often involves removing cotter pins, nuts, and possibly a wheel bearing retaining nut.
3. Remove the Axle Shaft: This is the most challenging part. You'll likely need to remove the axle shaft nut (often very tight), then carefully remove the axle shaft. This may require a slide hammer or other tools to break it free. The axle shaft will likely need to be separated from the differential. Pay close attention to how components go together – take photos as you disassemble.
4. Remove the Old Seal: Once the axle shaft is removed, you can access the old seal. A pry bar or small punch might be needed to gently remove it. Be careful not to damage the axle housing.
5. Clean the Housing: Thoroughly clean the axle housing bore where the new seal will go. Any debris can damage the new seal.
6. Install the New Seal: Use a seal driver to install the new seal. This prevents damage to the lip of the new seal. Never use a hammer directly on the seal.
7. Reassembly: Carefully reinstall the axle shaft, hub assembly, brake caliper, and wheel, reversing the disassembly steps.
8. Torque Specifications: Use a torque wrench to tighten all bolts and nuts to the manufacturer's specifications (found in your repair manual). Improper torque can damage components.
9. Check for Leaks: After reassembly, lower the vehicle and inspect for any leaks around the new seal.
Important Considerations:
* Wheel Bearings: Inspect your wheel bearings during this process. They may need replacement if damaged or worn.
* Differential Fluid: You'll likely lose some differential fluid during this process. Be prepared to refill it with the correct type and amount.
* Axle Shaft Condition: Inspect the axle shaft for damage. If it's bent or damaged, it might need to be replaced.
This is a simplified overview. A detailed repair manual specific to your 1997 Chevy Silverado 4x4 is essential for success. Numerous online resources and YouTube videos are available, but always cross-reference with the repair manual for accuracy. Again, if you're unsure about any step, take your truck to a qualified mechanic to avoid potential damage.
