Transfer Case Description and Operation: Notes
The transfer case (PTU) in this vehicle consists of an aluminum housing and a ring and pinion power transfer system.
The PTU transfers torque/power to the rear differential, gerotor pump design, via a two-piece propshaft assembly.
The on-demand rear differential distributes variable torque/power to the rear wheels via individual axle shafts.
The on-demand system operates as follows: only when front wheel slippage is encountered torque/power is proportioned to the rear wheels, as long as there is not front-to-rear speed difference; there is no torque/power to the rear wheels.
When front-to-rear wheel slippage does not occur, the rear differential, gerotor, pumps fluid stored in the sump to a piston that actuates a clutch pack, which then distributes torque/power to the rear wheels.