These steel silent gears are several times stronger than OEM’s. They can be used on any shaft that is 1”-15 spline, but are most common in the 1996-present Polaris and most Yamaha’s thru 2003.
11 Wide = 1/2″ Wide
13 Wide = 5/8″ Wide
15 Wide = 3/4″ Wide
Ski-Doo HYVO Conversion Gear, Upper
Energy Release Anti-Friction Metal Conditioner
15 Wide, 1″-15 Spline, Steel Lower Gear
HYVO Aluminum Lower Gear