The hub (A) connects the sleeve and pinion shaft.
The shift sleeve (B) can move in an axial direction. The shift sleeve engages the 39 teeth of the hub with a loose fit.
The champhered side (arrow) is used to hold the gear in the engaged position.
The flat surfaces of the hub are machined; the synchronizer ring and locking parts are held in place by these surfaces.
Material: case hardened steel.
B) Shift Sleeve
The shift sleeve (B) of the Porsche synchronization system is the immediate friction part for the synchronizer ring. The teeth of the shift sleeve fulfill two functions.
1 Power lock between clutch body and guide sleeve,
2. Frictional part for synchronizer ring during the synchronization phase.
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