Abstract: A four wheel drive automatic transmission, comprising: a speed-changing transmission unit; a front wheel transmission mechanism driven by the transmission unit and having a large driving gear and bearings for the large driving gear; a center differential unit having an input member driven by the large driving gear and two output members for driving front wheels and for driving rear wheels, respectively; a transfer with a rear wheel driving transmission having a driving gear member disposed coaxially with the output member for rear wheel driving, a connecting member between the output member for rear wheel driving and the driving gear member and a transfer output gear member driven by the driving gear member; a case in which the front wheel transmission mechanism, the center differential unit and the transfer are disposed; and, an oil separating structure defining separately lubricatable cavities within the case, the structure comprising two seal members, disposed between the connecting member and the case at

Abstract: An automatic transmission having: a torque converter; a first planetary gear set; a second planetary gear set, and friction elements operated by hydraulic servos.The first planetary gear set has a hydraulic servo drum D.sub.1 for a clutch C.sub.1 connected to an input shaft, a sun gear provided within drum D.sub.1 and connected to the input shaft by clutch C.sub.1, a carrier connected to an output shaft, a ring gear connected to the input shaft and an intermediate shaft, a clutch C.sub.2, provided in a hydraulic servo drum D.sub.2, pinions rotatably supported by the carrier, and the gear set is provided on the inner side of clutch C.sub.2.The second planetary gear set has a sun gear mounted on the intermediate shaft and connected to a common inner race of a one-way clutch F.sub.0, a one-way brake F.sub.1, a carrier connected to a ring gear, the ring gear is connected to the output shaft, the intermediate shaft and a brake B.sub.2, a one-way brake F.sub.2 in series with brake B.sub.