Prop up the rear door so it doesn't fall down and injure you when replacing the tailgate struts. Each end of the tailgate strut has a ball and socket type joint. In the cup part of the joint (part of the strut) is a little clip that prys out with a small straight blade screw driver. Pop out his clip and the ball and socket joint will pop apart with just a little leverage. These struts may be available from the aftermarket.