Alignment Caster Cam
Skyjacker Suspension 1039H Adjustable Camber/Caster Alignment Shim Kit
What Is an Alignment Caster Cam?
An alignment caster cam — sometimes called a cam bolt or eccentric cam — is a specialized fastener used in a vehicle's suspension system to fine-tune the caster angle. Alignment caster cams work by rotating an offset or eccentric bushing within a control arm mounting point, which shifts the position of the arm forward or rearward relative to the vehicle's centerline. This controlled movement directly changes the caster angle without requiring major suspension disassembly.
Why Caster Angle Matters
Caster is one of the three primary wheel alignment angles — alongside camber and toe — and it has a major influence on how a vehicle drives. Caster is defined as the angle formed by the forward or rearward tilt of the steering axis from vertical, as viewed from the side of the vehicle. Positive caster — where the top of the steering axis tilts rearward — is the factory setting for most modern vehicles and is what gives a car its straight-line stability and self-centering steering feel.
When caster falls out of spec, drivers often notice the vehicle pulling to one side, vague or overly heavy steering, and in some cases, uneven tire wear. Caster cams provide a direct, adjustable solution to bring the angle back into the manufacturer's specified range — or to dial it in for a specific performance or load application.
When Do You Need a Caster Cam?
Caster angle can drift out of specification for several reasons. Road impacts, worn bushings, lifted or lowered suspension, and general wear over time can all shift the geometry away from factory settings. Many vehicles — particularly trucks and SUVs that have been lifted — require aftermarket caster correction to compensate for the change in geometry introduced by the lift. Caster cams make this correction straightforward, offering a measurable degree of adjustability without requiring a full suspension overhaul.
- Corrects caster angle after a suspension lift or lowering
- Restores factory alignment specs after collision or hard impact
- Enables fine-tuning for performance driving or towing applications
- Addresses steering pull or instability caused by unequal side-to-side caster
Top Brands for Alignment Caster Cams
Moog Chassis Parts is the leading name in this category, and for good reason. Moog has long been regarded as the chassis industry's "Problem Solver," consistently introducing design enhancements that extend product life and simplify installation. Their caster cam bolt kits are engineered to provide precise caster, camber, and toe adjustability — even on vehicles that don't have factory-adjustable suspension — with an adjustment range typically spanning +/- 1.5 degrees.
SPC Performance rounds out the lineup with a focus on performance-oriented alignment solutions. SPC Performance is well known among enthusiasts and professional alignment shops for developing innovative, high-adjustability components that go beyond OEM replacement — making them a go-to choice for lifted trucks, lowered sport compacts, and track-day builds alike.
Choosing the Right Caster Cam
When selecting an alignment caster cam, confirm fitment by vehicle year, make, model, and trim — especially if the suspension has been modified. Check the adjustment range offered by the cam to ensure it covers your target correction, and verify whether the kit includes the necessary hardware (washers, nuts, and eccentric bushings) for a complete installation. Always perform a professional four-wheel alignment after installation to confirm all angles are within specification.