Bearing Cups and Cone and Roller Assemblies

Check bearing cups for rings, scores, galling, or excessively worn wear patterns. Pinion bearing cups must be solidly seated in the housing bores, Check for seating by attempting to insert a 0.O4mm (0.0015 inch) feeler between these cups and the bottoms of their bores.

NOTE: For 1989, the Dana Econoline axles include spacers outboard of the differential bearing cups to protect the housing if the bearing cup has spun in the housing. The Model 80 axle in the Super Duty has had the spacers since 1988 model introduction. Prior to 1989, the Econoline bearing cups were bonded to the housing.

When operated in the bearing cups, cone and roller assemblies must turn without roughness. Examine the large roller ends for wear. If the original blend radius has worn to a sharp edge, the bearing should be replaced.

If inspection reveals either a worn bearing cup or a worn cone and roller assembly, both parts should be replaced to avoid damage.