Our gearbox 4 GEARS,good performance,hight efficiency and competitive price Our gearbox1) 4 GEARS center distance=55.65+ - 0.03 transmission ratio: 1st I1=3.429 2nd I2=2.109 3rd I3=1.379 4th I4=1.00 Reverse Radio =3.6 Max. Torque output: 52.9N.m Measurement: 450*330*290(mm) Gear box for EV convertion kits,type of gear box