This kingpin ring is a wear component that sits between the steering knuckle and the axle housing in the front axle assembly. It provides a bearing surface that allows the knuckle to pivot smoothly under load while maintaining the correct vertical clearance in the joint. As the ring wears, the steering knuckle develops play, which leads to imprecise steering, uneven tire wear, and increased stress on the kingpin and bushings. The Corteco ring is formed to the same cross-section and material grade as the original, so it seats fully in the housing bore and maintains the factory clearance without shimming. On installation, ensure the bore and kingpin are clean and free of burrs; the ring should be pressed in squarely and the retaining hardware torqued to specification.