Drive, coupling element and method for operating a drive

A drive with an electric motor and transmission connected to the electric motor at a drive shaft. Transmission has gears with different transmission ratios. The transmission performs a shifting process in which a coupling of the drive shaft, driven by the electric motor rotating at a first rotational speed, to the output shaft via a first gear with a first transmission ratio is first released, whereby the drive shaft is no longer rotationally coupled to the output shaft, after which the drive shaft is rotationally coupled to the output shaft via a second gear with a second transmission ratio. An electric synchronizing device is provided to change a rotational speed of the electric motor to a second rotational speed for a duration of the shifting process. The second rotational speed corresponds to the first rotational speed multiplied by a quotient of the second transmission ratio and first transmission ratio, and the drive is designed to produce a releasable rotational coupling between the drive shaft and the output shaft via the second gear by positive engagement. The drive shaft is releasably coupled to the output shaft via a gear by at least one dog engaging a depression in a window extending along a direction of an element coupled to the drive shaft movable relative to an element coupled to the output shaft when not coupled to the drive shaft during a shifting process, so that the dog is movable into the depression through the window.