Power Transfer Unit (PTU)
WARNING: This page is about a different car, the 2023 Lincoln Nautilus. However, it is still accessible from the selected car via links, so may be relevant.
The power transfer unit is a gearbox attached to the transmission, that allows drive torque to be fed via a driveshaft to the rear axle via the RDU. For more information on the power transfer unit, Refer to: Power Transfer Unit - 2.0L . Refer to: Power Transfer Unit - 2.7L .