F 150 Super Crew 4WD V8-5.4L Prop SOHC VIN Z (2003)
2. Tighten the special tool to seat the pinion bearing cups into their bores.
Setting pinion depth
3. CAUTION: Whenever new cups are installed, new pinion bearings must also be installed.
NOTE: If a feeler gauge can be inserted between a cup and the bottom of its bore at any point around the cup the cup is not correctly seated.
Make sure the cups are correctly seated in their bores.