Grissom arc gears are suitable for the rear axle of light trucks at home and abroad. The material is 20CrMnTiH4/8620H.the process is: precision forging,isothermal normalizing,carburizing quenching and grinding. Gear accuracy can reach 6-7 levels, transmission noise is lower than 80dB, high strength and transmission is stable. Packaging and transportation is Suitable for ocean shipping,also can be customized according to customers.