A transfer case is a part of a vehicle’s drivetrain. It allows for two-wheel-drive or four-wheel-drive operation, and it can be operated automatically or manually.
The transfer case is connected to the transmission, which transfers power from the engine to the front differential and rear differential. The front differential sends power to two wheels on each side of the car, while the rear differential sends power to two wheels on one side of the vehicle.
The transfer case has several modes; Two High (2H), Four High (4H), Neutral (N), Four Low (4L), and Neutral (N). In Four High mode, both front and rear differentials are locked together to distribute power evenly between all four wheels. In Four Low mode, both front and rear differentials are locked together, but only send power to two wheels per side—the ones closest to each other—to increase traction off-road in Yorkville, NY. In Neutral mode, there is no torque transfer between any of the wheels.
Manual transfer cases have levers that allow you to change modes; automatic ones use sensors to determine when you need four-wheel traction and when you don’t.
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