A multi-gear powershift transmission for a working machine, in particular a forklift truck, which has a driveshaft (2) driven by a torque converter (1) such that, by way of fixed wheels (8, 13, 18, 23), loose wheels (10, 15, 20, 27) and shift clutches (4, 9, 19) arranged on countershafts (7, 12, 22) in a first transmission, at least two forward gears and two reverse gears can be engaged. The powershift transmission can be supplemented with a further countershaft (24) having a fixed wheel (25), a clutch (26) and a loose wheel (27) in order to produce a second powershift transmission in which three gears in the forward driving direction and three gears in the reverse driving direction are engageable.