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Metal or nylon DRIVE gear on the output shaft / Nylon DRIVEN gear on the end of the cable.
Inside the speedometer cable housing is a woven steel core that's supposed to be lubed every so often. When the lube dries out, the core binds up inside the housing, eventually snaps.
Auto parts stores sell a universal woven steel core kit. Cut it to length, coat with a fine film of graphite, install in the housing.