Installation device for installing a shell sliding door of a motor vehicle

The device (41) has a body connection (43) mounted to a body-in-white. A door connection (44) is mounted to a body-shell sliding door (42), where the door connection and the body connection are connected with each other by a joint (52). The door connection covers a mounting frame (48), which is installed at the body-shell sliding door. The mounting frame is provided at front and rear ends with assembly angles. An independent claim is also included for a method for painting a body-shell sliding door and an associated body-in-white of a motor vehicle.