Parts such as the Transmission: Circlip-type-c,25mm, Circlip-type-c,30mm, Washer,plain, Circlip are included in the Kaf620-ref Mule4010 2014 Usa / Trans4x4 Transmission parts fiche.
The most expensive part in this assembly is the Shaft,input.
The component with the lowest price in the Transmission schematic is the Circlip-type-c,25mm.