Carli 03-13 Dodge Ram 2500/3500 Extreme-Duty Ball Joint Package 4WDBall joints are made up of a lower ball joint and upper floating king pin. The upper ball joint is designed as a pivot point determining the axis on which the knuckle will move and thus, only sees a lateral load. The lower ball joint tracks the knuckle on an imperfect axis, the spherical lower is required to allow the knuckle to move freely with only a slight vertical travel through its steering cycle. Carli Extreme Duty Upper Ball Joints have a pin