how do you change gear lube inthe front end

1. Raise the vehicle on a hoist. 2. Remove the differential fill plug. 3. Use the oil suction gun and remove the axle lubricant through the fill opening. 4. If necessary, a cleaning solvent can be injected to remove any contaminants. 5. Repeat Step 3 to remove the cleaning solvent. 6. Refill the differential with Motorcraft SAE 80W90 Thermally Stable 4x4 Axle Lubricant meeting Ford specification WSP-M2C197-A. 7. Install the fill plug and tighten.