of one way brake 106 is provided to limit or prevent oil from entering the d brake 104 the inner radial end of return spring 108 continually contacts the piston 102 that actuates brake 104 the outer radial end of return spring 108 continually contacts a fixed structure so that the spring flexes as the piston 102 moves in the cylinder of the d brake 104 in this way return spring 108 also participates in the oil dam by limiting or preventing radial flow of oil into the d brake 104 caused by centrifugal force this arrangement permits brake 88 and clutches 76 80 to be mutually concentric located at an axial plane and located radially outward from the planetary gearsets 28 46 48 such that they do not add to the axial length of the gearbox similarly clutches 96 100 and brake 104 are mutually concentric and located radially outward from the planetary gearing 28 46 48 clutches 76 80 96 100 and brakes 88 104 106 comprise the control elements as fig2 a 2 b illustrate the front cylinder assembly 36 is supported for rotation on the fixed front support 24 and carrier 34 the front cylinder assembly 36 is formed with clutch actuation fluid passages each passage.