Four-Wheel Drive Systems - Overview: Notes

4WD system consists of the following components: 

• Transfer case

• AWD module

• Front driveshaft
• Rear driveshaft
• Rear axle 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 axle shafts. Torque (when commanded) is provided to the front wheels via the front driveshaft, front driveshaft, front differential, and front halfshafts.

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 .