The Pin-spring is the lowest priced item on this Differential schematic.
The Differential is made up of components including this Case-gear,differentia which is the most expensive.
Parts such as the Differential: Gear-helical,differen, Gear-bevel,10t, Washer,14.5x38x1.2, Shaft are included in the Kaf620-pbf Mule4000 2011 Usa Differential parts fiche.