Caster Angle Diagram - Ford Solid Axle Radius Arm & C-Bushing Steering Geometry

This document is a labeled schematic diagram illustrating the concept of caster angle in a vehicle's front suspension/steering geometry, drawn as a side view of a front wheel with a coil spring, axle, and radius arm. The diagram shows a vertical reference line passing through the wheel and a slanted line labeled as the centerline of the upper/lower ball joints (the steering axis); the angle between these two lines at the top is labeled 'Caster Angle.' A horizontal plane line runs beneath the tire to establish the ground reference. Callout arrows identify key suspension components: the Axle Tube at the wheel center, the Radius Arm extending toward the front of the vehicle (indicated by a large 'FRONT' arrow pointing right), the Steering Knuckle below the axle, and the C-Bushings where the radius arm mounts. The diagram teaches a reader how caster is defined, the tilt of the steering axis relative to vertical when viewed from the side, and which physical parts (radius arm, C-bushings) relate to setting or adjusting caster on this style of solid front axle suspension. No year, make, model, part numbers, or specification values are given in the document itself.