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A transfer case is a component in four-wheel drive and all-wheel drive vehicles that splits power from the transmission to the front and rear axles. It allows for different amounts of torque to be sent to each axle, enabling the vehicle to operate effectively in various driving conditions such as off-road terrain or slippery roads. Transfer cases typically have multiple operating modes, such as two-wheel drive, four-wheel drive high, and four-wheel drive low, that can be selected by the driver to optimize traction and performance.