Shift mechanism design with selector drums, electric motors, and spur gears for Smart ForTwo 451 automated manual transmission.

Exploded diagram of shift mechanism showing motors M17/3 and M17/4, selector drums, shift forks, and input shaft.

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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.