Here's a general overview of the process. Remember, this is NOT a substitute for a proper repair manual:
1. Preparation:
* Safety First: Jack up the truck securely using jack stands. Disconnect the negative battery terminal.
* Gather Tools: You'll need a socket set (likely metric), wrenches, a pry bar (possibly), possibly a hub removal tool, grease, and a torque wrench. Again, check your repair manual.
* Identify Hub Type: Determine if you have manual or automatic locking hubs. Manual hubs have a lever you engage; automatic hubs engage automatically. The process differs slightly.
2. Removing the Old Hubs (General Steps):
* Remove Wheel and Tire: Remove the wheel and tire from the affected axle.
* Remove the Hub Nut: Use a large socket and impact wrench (recommended) to remove the hub nut. This nut is usually very tight. If you don't have an impact wrench, you might need a breaker bar and potentially even a cheater bar.
* Remove the Rotor (if applicable): On some models, you'll need to remove the brake rotor before accessing the hub. This often involves removing caliper mounting bolts and potentially using a C-clamp to compress the caliper piston. Be careful not to damage the brake lines.
* Separate Hub from Axle: This is where things get more specific to your hub type.
* Manual Locking Hubs: These often have a retaining clip or ring that needs to be removed. Then, the hub might simply pull off. Sometimes a hub puller is necessary.
* Automatic Locking Hubs: These are usually more integrated and may require specialized tools or techniques for removal. Consult your repair manual.
* Inspect Components: Inspect the axle seals and bearings for wear or damage. Replace them if necessary.
3. Installing the New Hubs (General Steps):
* Lubricate: Lightly grease the new hubs and any contact points as specified in your manual.
* Install Hub onto Axle: Push the new hub onto the axle. Ensure it seats correctly.
* Reinstall Retaining Ring/Clip (if applicable): Securely install any retaining clips or rings.
* Reinstall Rotor (if applicable): Reinstall the brake rotor, ensuring it's properly seated and torqued to specification.
* Reinstall Hub Nut: Torque the hub nut to the manufacturer's specified torque setting – this is CRITICAL and must be precise to avoid damage.
* Reinstall Wheel and Tire: Mount the wheel and tire, torque the lug nuts to the proper specification.
4. Testing:
* Lower the Truck: Carefully lower the truck to the ground using the jack stands.
* Test Drive: Take a short test drive to ensure the new hubs are functioning correctly and there are no unusual noises.
Important Considerations:
* Wheel Bearings: If you notice any play in the wheel bearings during disassembly, replace them. This is a much more involved repair.
* Automatic Hubs: Replacing automatic hubs is often more complex and may require special tools or expertise. Consider having a professional mechanic handle this if you are not comfortable.
* Torque Specifications: Using the correct torque wrench and the manufacturer's torque specifications is absolutely essential to prevent damage.
This is a generalized overview. Always consult a repair manual specific to your 1999 Ford F-250 before attempting this repair. Improper installation can lead to serious damage to your vehicle. If you are not comfortable performing this repair yourself, take your truck to a qualified mechanic.
