BW44-40 Transfer Case (Service Information): Operation

The Borg Warner 44-40 is a full time All Wheel Drive (AWD) transfer case with a fixed gear ratio. Depending on traction conditions, the Powertrain Control Module (PCM) will modulate the electromagnetic clutch assembly to vary the amount of torque applied to the front axle. Torque is transmitted through the input shaft to the clutch and drive sprocket assembly, and is transferred directly to the rear propeller shaft, and to the output shaft and front propeller shaft by the drive chain. The oil pump circulates gear lube throughout the case to provide clutch cooling, and the Drivetrain Control Module (DTCM) monitors the temperature of the transfer case with a temperature sensor.