Which component is checked for clearance between the spider gear and differential case?

The component checked for clearance between the spider gear and the differential case is the side gear. In a differential assembly, the side gears are connected to the axles and rotate with them, while the spider gears allow for the differences in wheel speed during turns.

When examining the differential, it is crucial to assess the clearance between the side gear and the spider gear, as proper clearance ensures that the gears can mesh smoothly without binding. If there's insufficient clearance, it can lead to excessive wear or failure of the gears, causing poor handling and potentially damaging the differential system. Clearance between these components is essential for smooth operation and longevity of the differential.

The other components mentioned, while part of the differential assembly, do not directly affect the clearance between the spider gear and the differential case like the side gear does. Hence, the focus on the side gear is crucial in maintaining the proper function of the differential.