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What is the Purpose of the Transfer Case?

The transfer case is where the actual transfer of wheel ratio occurs as you shift your four-wheel or all-wheel-drive vehicle from the two-wheel to four-wheel function. Depending on how your system is set up, the transfer case either operates with a chain drive or gears. The general outcome is the same.

The natural rotation of your front and rear tires occurs at different speeds. In order for the four-wheel drive to work, all four tires need to turn at the same time. The transfer case coordinates the front and rear axle rotation by slowing the speed down.

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