This gear set is for the EZGO 1988′-2013′ Electric & 2 Cycle Gas models, with the (Common) Dana Rear End Axle. By installing this high speed gear set you can add up to an extra 6-8 mph faster to the vehicle. Install larger tires and you can go even faster. FYI-Adding gears will decrease the vehicle torque. Theses gears should be installed by a well inclined person or service mechanic and may need a bearing press to complete installation.