Borg-Warner synchronization mechanism in automated manual transmission for smart fortwo 451, showing clutch body, synchronizer ring, shift collar, and locking splines.

Technical diagram of transmission synchronization components with four numbered callouts identifying internal parts.

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See all Powertrain figures for the Fortwo (451), or browse the full figure library. Part numbers and callouts are community-sourced and cross-referenced against the manuals — confirm with your VIN before ordering.