* Steering Stability: Caster is the angle of the steering axis from vertical, where the top of the steering axis is further back than the bottom. This creates a self-centering effect. As the van moves forward, the wheels are pulled back to the straight-ahead position, making steering smoother and less effortful. Without sufficient caster, the steering would be vague and require more constant correction.
* Straight-line Stability: Caster contributes to directional stability, especially at higher speeds. It helps resist wandering and makes the van track straighter.
* Load-Bearing: A 3500 van is designed for heavy loads. The caster angle helps manage the weight distribution and maintain stable handling even when fully loaded.
If the lean seems *excessive* or unusual, then it's not simply the intended caster, but could indicate a problem:
* Worn or Damaged Suspension Components: Worn ball joints, control arm bushings, tie rod ends, or king pins can alter the caster angle.
* Bent Steering Components: An accident or impact could have bent a steering component, altering the geometry.
* Improper Alignment: The van might need a front-end alignment. This is a critical adjustment that sets the caster, camber (vertical angle of the wheels), and toe (inward/outward pointing of the wheels).
In short: Some inward lean is normal and desirable. Excessive or sudden changes in the lean warrant professional inspection by a mechanic specializing in vehicle alignment and suspension. They can diagnose the exact cause and perform the necessary repairs or adjustments.
