1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Section 100-02 . 2. Remove the brake disc. For additional information, refer to Section 206-04 . 3. Index-mark the driveshaft flange and pinion flange for correct alignment during installation. 4. Remove the 4 driveshaft flange bolts. 5. NOTE: The driveshaft centering socket yoke fits tightly on the pinion flange pilot. Never hammer on the driveshaft or any of its components to disconnect the driveshaft centering socket yoke from the pinion flange. Pry only in the area shown with a suitable tool to disconnect the driveshaft centering socket yoke from the pinion flange. Using a suitable tool as shown, disconnect the driveshaft centering socket yoke from the pinion flange. ? Using mechanic’s wire, position the driveshaft aside. 6. Using a Nm (lb-in) torque wrench on the pinion nut, record the torque required to maintain rotation of the pinion gear through several revolutions. 7. Using the special tool to hold the pinion flange, remove and discard the pinion nut.2005 F-150 Workshop Manual 8. Index-mark the pinion flange in relation to the drive pinion stem to make sure of correct alignment during installation. 9. Using the special tool, remove the pinion flange. 10. Force up on the metal flange of the drive pinion seal. Install gripping pliers and strike with a hammer until the drive pinion seal is removed. Installation 1. Lubricate the new drive pinion seal with grease. 2. Using the special tool, install a new drive pinion seal. 3. Lubricate the pinion flange splines with axle lubricant. 4. NOTE: Disregard the scribe marks if a new pinion flange is being installed. Align the pinion flange with the drive pinion shaft. 5. Using the special tool, install the pinion flange. 6. l a new pinion nut with the same iginal if not replacing the collapsible spacer. If a installed, install the nut in the kit, as indicated in the chart below, or damage to the component may occur. Position the new pinion nut. Pinion Nut 7. no circumstances ut to be backed off to reduce drive pinion bearing preload. If reduced drive pinion bearing preload is required, a new drive pinion collapsible spacer and pinion nut must be installed or damage to the component may occur. NOTE: Remove the special tool while taking drive pinion bearing preload readings with the Nm (lb-in) torque wrench. Using the special tool to hold the pinion flange, tighten the pinion nut. ? Rotate the drive pinion occasionally to make sure the drive pinion bearings are seating correctly. ? Install a Nm (lb-in) torque wrench on the pinion nut. ? Rotating the drive pinion through several revolutions, take frequent drive pinion bearing preload readings until the original recorded drive pinion bearing preload reading is obtained. ? If the original recorded drive pinion bearing preload is lower than specification, tighten to the appropriate specification for used drive pinion bearings. If the drive pinion bearing preload is higher than specification, tighten the pinion nut to the original reading as recorded. For additional information, refer to the Specification portion of this section. 8. Position the driveshaft and align the index mark on the pinion flange.