A limited slip differential assembly comprising: a differential casing defining first and second output shaft openings that are co-axially aligned along an axis of rotation of the differential casing; a first and a second side gear (40, 42) rotatably mounted within the differential casing, the first and second side gears (40, 42) being co-axially aligned along the axis of rotation of the differential casing, the first side gear defining a first axle shaft opening configured to provide a first torque transmitting connection with a first output shaft received within the first output shaft opening, the second side gear defining a second axle shaft opening configured to provide a second torque transmitting connection with a second output shaft received within the second output shaft opening; a pair of pinion gears mounted between the first and second side gears (40, 42), both of the pinion gears being rotatably mounted on a cross shaft that is fixed for rotation with the differential casing; a clutch pack disposed within the differential casing and including a plurality of annular plates interleaved between a plurality of annular friction disks, the clutch pack arranged on a first side of the cross shaft; an actuator assembly disposed outside the differential casing and comprising a piston received in a piston housing, the actuator assembly configured to actuate the clutch pack, the actuator assembly arranged on a second side of the cross shaft, opposite the first side, characterized by a lug formed on one of the piston and piston housing; and a groove defined by a groove wall on the other of the piston and the piston housing, wherein the lug is received by the groove and engagement of the lug and the groove wall inhibits rotation of the piston around a central piston axis. a differential casing defining first and second output shaft openings that are co-axially aligned along an axis of rotation of the differential casing; a first and a second side gear (40, 42) rotatably mounted within the differential casing, the first and second side gears (40, 42) being co-axially aligned along the axis of rotation of the differential casing, the first side gear defining a first axle shaft opening configured to provide a first torque transmitting connection with a first output shaft received within the first output shaft opening, the second side gear defining a second axle shaft opening configured to provide a second torque transmitting connection with a second output shaft received within the second output shaft opening; a pair of pinion gears mounted between the first and second side gears (40, 42), both of the pinion gears being rotatably mounted on a cross shaft that is fixed for rotation with the differential casing; a clutch pack disposed within the differential casing and including a plurality of annular plates interleaved between a plurality of annular friction disks, the clutch pack arranged on a first side of the cross shaft; an actuator assembly disposed outside the differential casing and comprising a piston received in a piston housing, the actuator assembly configured to actuate the clutch pack, the actuator assembly arranged on a second side of the cross shaft, opposite the first side, characterized by a lug formed on one of the piston and piston housing; and a groove defined by a groove wall on the other of the piston and the piston housing, wherein the lug is received by the groove and engagement of the lug and the groove wall inhibits rotation of the piston around a central piston axis.