Alignment Caster Kit
BD Diesel 1032103 Cam Caster Adjusting Kit Ford Super Duty 2011-2022
Whiteline KCA301 Front Lower Control Arm Inner Caster Adjustment Kit
Whiteline KCA469 Lower Inner Rear Control Arm Bushing Kit - Double Offset
Representative Photo, actual item may vary
What Are Alignment Caster Kits?
Alignment caster kits are specialized suspension adjustment components designed to correct or optimize the caster angle of your vehicle's front suspension. Caster angle is the angular displacement from the vertical axis of the suspension of a steered wheel, measured in the longitudinal direction through the upper and lower pivot points. These kits typically include hardware such as offset bushings, cam bolts, eccentric adjusters, or complete replacement control arms that allow alignment technicians to fine-tune this critical steering geometry angle.
Why Caster Adjustment Matters
When the front suspension of a vehicle is aligned, caster is adjusted to achieve a self-centering action in the steering, which affects the vehicle's straight-line stability. Caster angle settings allow the car to balance steering effort, high speed stability and front end cornering effectiveness, with increasing positive caster improving straight line tracking and high speed stability. When caster angles fall out of specification—whether from worn suspension components, collision damage, or suspension modifications—a caster kit provides the adjustability needed to restore proper alignment.
Improper caster can cause unpleasant handling where the vehicle veers to one side unless continually corrected by the driver, and dramatically increases tire wear due to constant steering correction. For performance enthusiasts, aftermarket caster kits offer increased adjustment range beyond factory specifications, enabling better cornering characteristics and more responsive handling on track days or spirited driving.
When You Need a Caster Kit
On vehicles with strut suspensions, there may not be a factory adjustment for caster at the upper strut mounts or lower control arms, so aftermarket camber/caster adjustment kits become necessary if caster is out of specifications. These kits are essential after lowering your vehicle, following suspension component replacement, or when alignment readings show caster angles outside manufacturer specifications. They're also popular upgrades for racing applications where precise suspension geometry tuning is critical for competitive performance.
An alignment caster kit corrects alignment problems using hardware and suspension parts ranging from simple adjusters like cam bolts to entirely new control arms or other components. Professional alignment shops rely on these kits to provide the adjustment capability needed when factory settings are insufficient or when suspension geometry has been altered through modifications.
Top Brands for Alignment Caster Kits
When selecting alignment caster components, quality and precision engineering are paramount. SPC Performance has established itself as a leading specialist in suspension alignment solutions, offering precision-engineered adjusters and bushings designed specifically for correcting caster and camber angles across a wide range of vehicle applications.