In order to understand how a diff actuator works, it is first important to have a basic understanding of what a differential is and how it operates. A differential is a gearbox component that allows two shafts connected to it to rotate at different speeds. This is necessary in order for wheels on the same axle to rotate at different speeds when going around corners.
The way a diff actuator works is by providing hydraulic pressure to the differential whenever one wheel starts to slip. This will cause the other wheel that is not slipping to receive more power and start rotating faster. As a result, this helps keep the vehicle from losing traction and becoming stuck.