The differential carrier consists of a ring gear and drive pinion configuration with a viscous coupling mounted in the front of the carrier assembly. The viscous coupling consists of an outer housing,silicon fluid, an inner hub and a number of inner and outer plates splined to the outer housing and the inner hub respectively.

The outer housing of the viscous coupling is connected to the propeller shaft which rotates in synchronization with the front wheel drive shafts. The inner hub of the coupling is connected to the drive pinion of the differential carrier that rotates in synchronization with the rear wheel drive shafts. When the front wheels loose traction, they speed up, this speed increase is generated through the propeller shaft to the outer housing of the viscous coupling creating a shearing of the silicon fluid between the inner and outer plates within the coupling. This action drives the inner hub of the coupling, transfering torque to the rear wheels through the differential carrier, this transfer of torque slows the front wheel speed.