The proper way is to close the liftgate, install the liftgate window to the liftgate, open the liftgate, install the new liftgate window hinge pin retainers, close the liftgate, open and support the liftgate window, install the liftgate window struts, connect the liftgate window defogger electrical connectors if equipped, and remove the support and close window.
By BobGM Specialist
01/11/2022