member 12 defines a piston chamber 22 having a first chamber portion 22 a and a second chamber portion 22 b a stage separator plate 24 is provided between the first chamber portion 22 a and the second chamber portion 22 b an apply piston 26 is disposed in the first chamber portion 22 a of the piston chamber 22 and includes an inner diameter seal 28 engaging an inner diameter surface of the piston chamber 22 an outer diameter seal 30 is provided on an outer diameter portion of the piston 26 and engages an outer diameter surface of the piston chamber 22 the apply piston 26 includes an axially extending arm portion 32 which engages the clutch pack 16 for applying axial pressure thereto as will be described in greater detail herein an amplifier piston 34 is provided in the second chamber portion 22 b of the piston chamber 22 and includes an outer diameter seal 36 which engages an outer diameter surface of the piston chamber 22 and an inner diameter seal 38 which engages an inner diameter surface of the piston chamber 22 a plurality of amplifier drive pins 40 are provided in engagement with the apply piston 26 and the amplifier piston 34 as shown in fig2 preferably three or more.