This is the jam nut that the factory used on all 2016 and newer drive clutches. The earlier 900 Ranger and RZR drive clutches did not come with this jam nut and are prone to having the spider unthread. If your clutch is missing the jam nut I highly suggest installing it to prevent the spider from threading off. If you install our ECU tune and clutch kit package and want good insurance your spider will stay tight then install this jam nut when installing our clutch kit.
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works like it should