Synchronizer assembly (or synchronizer components) used in the transmission system of heavy-duty trucks (Sinotruk). It is a core component of the gearbox/transmission.

This type of synchronizer assembly is widely used in heavy-duty truck transmissions and is compatible with the drivetrain systems of Sinotruk vehicles (e.g., Howo, SITRAK, etc.).

As the "shift synchronization device" in Sinotruk transmissions, it allows the driver to change gears more smoothly, preventing gear clash and jerking. It is a key subassembly for ensuring transmission efficiency in heavy-duty trucks.