Differential Assembly: Description and Operation

Rear Drive Axle Description and Operation





The rear drive axle assembly in this vehicle consists of an aluminum housing which contains a electric clutch which is located in the driveline torque tube (for vehicles equipped with all wheel drive AWD only) and separate from the rear drive. The differential fluid is only contained in the rear drive axle portion of the rear differential assembly.

The clutch assembly for AWD vehicles is serviced separately from the driveline torque tube assembly. The clutch control module (CCM) is located on the torque tube housing and is serviced separately.

The clutch assembly contains automatic transmission fluid (ATF). There is a seal that protects the driveline torque tube from the ATF contained inside the clutch assembly. Another seal protects the clutch assembly from gear oil.

The driveline torque tube houses the third section of the propeller shaft packing purposes only. There is one bearing at each end of the torque tube assembly.

The clutch control module has integrated active clutch control logic.

The clutch can provide torque to the differential portion of the rear drive axle under a wide range of driving conditions. It differs from past on-demand systems as it can preload the clutch during take off to provide a less likelihood of wheel slip.

The clutch control module (CCM) is connected to the vehicle serial data stream via the control area network (CAN).

It uses data stream information from the engine control module (ECM) and the ABS/stability control module. The CCM monitors such signals as individual wheel speeds, ABS/stability control active, throttle position or wheel torque request to determine mode of operation.

The fluid level range for proper rear drive axle assembly operation is 0.8 liter. New service replacement units will be shipped dry (without fluid). Fill new units with 0.8 liter of GL Synthetic fluid. The minimum fluid level should be even with the bottom of the fill hole.