Abstract: An tool for installation of a ball joint into an interference-fit accommodating hole in a control arm of a vehicle is provided, which operates as an integrated unit. A body of the ball joint compressor includes an upper and a lower support, spaced apart and fixedly interconnected by a pair of bilateral supports. A movable compression member is mounted to the body of the ball joint compressor, to allow movement thereof between the upper and lower supports along a central vertical axis. An advancing screw is threaded through the lower support, providing a means by which movement may be imparted to the movable compression member. The upper support includes an upper stop extending downwardly and including a cavity for receiving a portion of a ball joint which protrudes through an accommodating hole in a control arm during compression. This configuration allows the upper stop to contact the control arm from above, adjacent to the accommodating hole for the ball joint.