These HD 'King Pin' style joints replace the original sliding-ball design upper joints on late-model 4500 and 5500 Dodge trucks and rebadged Sterling Bullets. They provide independent adjustment up to 1.0 degree of camber or caster change (camber only on 4WD models due to outboard axle seals) to correct camber or cross-camber issues or to add caster on RWD models for improved tracking. * Note: 23850 is an OEM Replacement Ball Joint with no change in camber or caster. California Residents WARNING