if you see mail pls contact me who are you? what is your name? i can not contact you a waiting for your msn or mail Detailed Product Description Center distance: 55.56mm Engine displacement: 1.0L Max.input torque: 79N.m Max.input power: 28kW Max.input peed: 5500rpm Some Data About Rear-Drive Transmission: Center distance: 55.56mm Engine displacement: 1.0L Max.input torque: 79N.m Max.input power: 28kW Max.input peed: 5500rpm This kind of rear-drive transmission is to change the running speed or traction device of automobiles and other machines, formed by a number of different gears which has various diameter.