This is a replacement Top Drive Gear / Slipper Shaft for the Traxxas Nitro Rustler & Nitro Slash.
The top gear is the only gear in the transmission driven directly by the spur gear. This is done through the top gear shaft which sticks out of the side of the transmission so that the spur gear can be mounted on it. Inside the transmission, the top gear drives the larger Idler gear which in turn, spins the differential gear.
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