... differential,which is to be widely used in China 4 speed ratio transmission gearbox with differentail and installed on rear ... 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. ... Weight:24kg cast iron shell,with strong load capacity 4 speed differential gearbox