F 450 4WD Super Duty V10-6.8L VIN D (2004)
5. CAUTION: Whenever the cups are replaced, the differential pinion bearings must also be replaced.
Make sure the cups are properly seated in their bores.
If a feeler gauge of the specification shown in the illustration can be inserted between a cup and the bottom of its bore at any point around the cup,
the cup is not properly seated.
