Four-Wheel Drive Systems - Vehicles Built Up To: 15-August-2020 - Overview: Notes

4WD system consists of the following components: 

• Transfer case

• AWD module

• Front axle disconnect actuator

• Front half shaft speed sensor
• Front driveshaft
• Rear driveshaft
• Rear half shafts
• Front half shafts
• Front differential
• Rear differential

The AWD system uses a single speed automatically activating transfer case. When torque is required at the front axle, the transfer case motor applies torque to a ball ramp activated high capacity clutch pack, allowing torque from the input shaft to be provided to both the rear driveshaft output flange, and the front axle output shaft via a chain drive. Torque is always provided to the rear wheels via the rear driveshaft, rear differential and driveshafts. Torque (when commanded) is provided to the front wheels via the front driveshaft, front differential side gear and the front axle disconnect actuator.

The transfer case consists of the following components: 

• Transfer case clutch actuator with integral position sensors A and B

• Actuator motor reduction gearset

• Clutch ramp and ball ramp

• Input shaft

• Front output shaft

• Rear output shaft

• Chain drive from input shaft to front output shaft

For additional information, refer to: Transfer Case - Overview .

Front Axle Disconnect Actuator 

The front axle disconnect actuator is located between the LH halfshaft and the front differential side gear. The front axle disconnect actuator includes the front axle intermediate shaft. When commanded by the all wheel drive control module, the front axle disconnect actuator engages the front drive axle to the front left half shaft, transferring s torque from the front differential, through the intermediate shaft to the LH half shaft, providing AWD functionality.

The front axle disconnect actuator consists of the following components: 

• Housing

• Electromagnetic field coil

• Armature cam

• Clutch ring

• Latching mechanism