Abstract: A transfer case including a hydraulically actuated torque-coupling device is provided for selectively actuating a secondary drive axle of an All-Wheel Drive motor vehicle when wheel slippage occurs with a primary axle. The transfer case comprises a housing, an input shaft and an output shaft both rotatably supported within the housing, and the torque-coupling device. The torque-coupling device comprises a hollow casing, a selectively engageable friction clutch assembly for operatively coupling the input shaft to the output shaft, and a hydraulic clutch actuator. The hydraulic actuator includes a hydraulic pump located within the casing and adapted to generate a hydraulic pressure to frictionally load the friction clutch assembly, and a variable pressure relief valve assembly fluidly communicating with the hydraulic pump to selectively control the hydraulic pressure generated by the pump.

Abstract: The invention is directed to a vehicle front-drive axle assembly having a front differential including a housing supporting left hand and right hand one-piece assemblies. Each of the left hand and right hand assemblies extend outwardly from the housing, and include an axle tube having a first end coupled to the housing and a second end having an integral yoke member. The one-piece assemblies further have integral bracket assemblies having outwardly extending mounting portions for mounting of vehicle suspension components and for securing the axle assembly to the vehicle. Each of the left hand and right hand one-piece assemblies are manufactured by suitable casting procedures, providing an assembly which has greater structural integrity than when multiple components are welded together, and which reduces cost and simplifies assembly into the vehicle.