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A transfer case output shaft is designed to transfer the motion of power and torque from the powertrain to the rear wheels of a four-wheel drive vehicle.

Four-wheel drive (4WD) and all-wheel drive (AWD) may operate differently but the theory is still the same.

Do you drive an all-wheel drive, or four-wheel drive vehicle? If so, you can bet it most likely has transfer case fluid.

A transfer case is a part of a drivetrain system.