When the driver selects four-wheel drive, the shift motor moves the transfer case into four-wheel drive mode. This causes the front and rear wheels to receive power from the transmission. When the driver selects two-wheel drive, the shift motor moves the transfer case into two-wheel drive mode. This causes the rear wheels to receive power from the transmission, while the front wheels are not powered.
The transfer case shift motor is typically controlled by a switch on the vehicle's dashboard. Some vehicles also have a switch on the center console that can be used to shift the transfer case.
The transfer case shift motor is an important part of a four-wheel drive vehicle. It allows the driver to quickly and easily switch between two-wheel drive and four-wheel drive mode, depending on the driving conditions.