Here's a general outline of the steps. Specific details may vary slightly depending on the exact configuration of your truck (e.g., axle type, specific options). Always consult a repair manual specific to your year, make, and model for detailed instructions and torque specifications.
Tools You'll Likely Need:
* Jack and jack stands (securely supporting the truck is crucial!)
* Wheel chocks
* Wrench set (metric) including sockets, ratchets, and extensions
* Torque wrench
* Axle nut socket (often large and deep)
* Axle shaft puller
* Hammer (possibly a slide hammer)
* Pry bar (carefully!)
* Penetrating oil (like PB Blaster)
* Drain pan for gear oil
* Gloves
* Safety glasses
Steps (General Outline):
1. Safety First: Disconnect the negative battery terminal. Secure the truck on jack stands. Chock the front wheels.
2. Remove the Wheels: Remove the wheels from the rear axle.
3. Drain the Differential: Locate the differential drain plug (usually on the bottom of the differential housing) and drain the gear oil into a drain pan.
4. Disconnect Driveshaft: Disconnect the driveshaft from the differential. This usually involves unbolting the driveshaft from the differential yoke. Mark the driveshaft and yoke alignment before disconnecting to ensure proper reassembly.
5. Remove Brake Components: Depending on your specific axle setup, you might need to remove brake components like calipers and rotors to access the axle. Support the caliper with a wire or bungee cord to prevent damage to the brake line.
6. Remove Axle Flanges: Locate the axle flange nuts on the differential. These are usually large and may be very tight. Use penetrating oil and a breaker bar or impact wrench if needed. Remove the nuts and pull the axles outward. Often, there's a C-clip or retainer holding the axle in place, which needs to be removed before completely removing the axles.
7. Remove Axle Shafts: The axle shafts should now be free to slide out. You may need an axle shaft puller to help remove them. If they're stubborn, a slide hammer might be necessary, but be careful not to damage the differential.
8. Clean and Inspect: Inspect the axles, differential, and other components for wear or damage.
9. Reassembly: Reassembly is the reverse of the removal process. Make sure to apply the correct amount of lubricant to the parts. Torque all bolts and nuts to the manufacturer's specifications. Remember to refill the differential with the correct type and amount of gear oil.
Important Considerations:
* Axle Type: Different Silverado models may have different axle types (e.g., 8.5-inch, 10-bolt, etc.). This affects the specifics of the removal process. Knowing your axle type is vital.
* Repair Manual: A repair manual specific to your 1998 Chevy Silverado 4WD is indispensable. It will provide detailed diagrams, torque specifications, and step-by-step instructions.
* Safety: Working under a vehicle is dangerous. Always use jack stands and follow safe practices.
Again, this is a complex process. If you are not comfortable with this level of vehicle repair, take your truck to a qualified mechanic. Improperly removing or reinstalling axles can cause serious damage to your vehicle.
