Here's a general outline. Specific steps and tools may vary slightly depending on the year of your F-150. Always consult a repair manual specific to your vehicle's year and model for precise instructions and torque specifications. A Haynes or Chilton manual, or a factory service manual, will be invaluable.
Tools You'll Likely Need:
* Jack and jack stands: Safety first! Securely support the truck.
* Wheel chocks: Essential for safety.
* Lug wrench: To remove the wheels.
* Sockets and wrenches (various sizes): For removing axle nuts, bolts, and other fasteners.
* Torque wrench: Crucial for tightening bolts to the correct specifications.
* Penetrating oil: To help loosen rusted or seized bolts.
* Hammer and punch: Possibly needed to tap out the old seal.
* Seal installer: To properly install the new seal without damaging it. (Highly recommended)
* New axle seal: Get the correct part for your axle.
* Clean rags and shop towels: To keep things clean.
* Drain pan: To catch the gear oil.
* Gloves and safety glasses: Always wear appropriate safety gear.
* Differential cover gasket (likely): You'll probably need a new one if you remove the cover.
* Gear oil (correct type and quantity for your axle): Refer to your owner's manual.
General Steps (This is not a complete guide and should not be used as the sole source of instructions):
1. Safety First: Securely jack up the truck and place it on jack stands. Engage the parking brake and use wheel chocks.
2. Remove the Wheel and Brake Components: Remove the wheel, brake caliper (support it to prevent stress on the brake line), and rotor.
3. Remove the Axle Flange: This may involve removing nuts and cotter pins securing the axle flange to the axle shaft. You may need a large socket and breaker bar. Mark the position of components for proper reassembly.
4. Drain the Differential: Locate the differential drain plug and drain the gear oil into a drain pan.
5. Remove the Axle Shaft (Potentially): Depending on your F-150's design, you might need to remove the entire axle shaft to access the seal. This is more involved and requires additional tools and steps. Consult your repair manual.
6. Remove the Old Seal: Carefully remove the old seal using a seal puller or other suitable tool. Be careful not to damage the axle housing.
7. Clean the Axle Housing: Thoroughly clean the axle housing where the new seal will sit, removing any old seal material or debris.
8. Install the New Seal: Use a seal installer to correctly install the new seal, preventing damage. Install it evenly and without forcing it.
9. Reassemble Everything: Carefully reassemble all components, following the disassembly steps in reverse. Pay close attention to torque specifications for all bolts and nuts.
10. Refill the Differential: Refill the differential with the correct type and quantity of gear oil, as specified in your owner's manual.
11. Check for Leaks: After reassembly, check for any leaks around the axle seal.
Important Considerations:
* Axle Shaft Removal: Removing the axle shaft is often required, and this adds significant complexity.
* Torque Specifications: Using the correct torque is critical to prevent damage.
* Precision: Careless work can lead to leaks, damage to the axle, and potentially catastrophic failure.
Again, this is a general overview. A repair manual specific to your F-150 is absolutely necessary. If you are not comfortable performing this repair, take your vehicle to a qualified mechanic.
