Cast iron made Differential Case Housing is used for installation of gear assemblies. Tolerance level and surface finish type of this automobile product depend on customer’s preference level. Latest reaming, drilling and turning procedures have been adopted to maintain design precision of this product. Holes of this Differential Case Housing have been created by following drilling, plunging and chamfering technology. Standard of this component has been verified on the basis of its surface finish, dimension, selection of raw materials etc.