... differential,which is to be widely used in China 4 speed ratio transmission gearbox with differentail and installed on rear axle engine ... on shell style tricycle axle,with 3 forward speed and 1 reverse speedForward Ratio:10:31,15:35,4.66:31, ... Reverse ratio:4.56:31 Output side Spline teeth No. 19, ... Weight:24kg cast iron shell,with strong load capacity 4 speed differential gearbox