Alignment Shim

What Are Alignment Shims and Why Do They Matter?

Alignment shims are precision-engineered spacers installed between suspension components to fine-tune the angles that govern how your tires contact the road. By adjusting camber (the inward or outward tilt of the wheel), toe (whether the fronts of the tires point toward or away from each other), and caster (the steering axis angle), alignment shims restore factory geometry after wear, body modifications, or suspension lifts. Even a fraction of a degree off-spec can translate into uneven tire wear, pulling to one side, and compromised handling — making shims one of the most cost-effective tools in any alignment job.

When Do You Need Alignment Shims?

Alignment shims are most commonly needed after a lift kit or leveling kit installation, after significant suspension component wear or replacement, or when a vehicle pulls to one side despite new parts. Leaf-spring trucks and SUVs also rely on pinion angle shims to keep the driveshaft running true after ride-height changes. Front-wheel-drive cars frequently use rear toe and camber shims to return the rear axle to factory specification without requiring expensive adjustable arms.

Key Considerations When Shopping for Alignment Shims

• Angle of correction: Shims are available in precise degree increments; match the shim angle to the alignment deviation measured on an alignment rack.
• Material: Look for aluminum, zinc alloy, or manganese bronze options — each balances weight, strength, and corrosion resistance for different applications.
• Application fit: Shims are application-specific. Always verify the leaf-spring width, bolt pattern, or spindle size for your vehicle before ordering.
• Stackability: Some shim systems allow two shims to be combined for larger angle corrections, offering greater flexibility without purchasing additional hardware.
• OEM vs. aftermarket lifts: Vehicles that have been lifted often require greater correction angles than stock-height vehicles, so choose a shim set designed for your ride height.

Top Alignment Shim Brands

SPC Performance is the dominant name in alignment shims and the category leader here by a wide margin. SPC Performance offers an extensive lineup that spans rear toe-and-camber shim kits for front-wheel-drive cars — featuring adjustments in fine increments — all the way to heavy-duty pinion angle shims for 2WD and 4WD trucks and SUVs. Their EZ Shim dual-angle design is a standout innovation, correcting both toe and camber simultaneously with a single patented shim.

Moog Chassis Parts brings decades of OE-quality engineering to its alignment shim lineup. Moog's full-contact rear shims are manufactured from non-corrosive materials and are accurate to one-tenth of a degree, making them a trusted choice for professional technicians who need precision they can count on.

Mevotech rounds out the selection with a broad catalog of fitment-specific shims designed to bring vehicles back to factory specification. Mevotech is well-regarded for delivering reliable aftermarket components that meet or exceed OE standards, making their shims a practical option for a wide range of makes and models.

Auveco supplies professional-grade fasteners and hardware, including alignment shim stock that shop technicians rely on for precise, durable solutions during chassis service.

Skyjacker Suspension is a trusted name in lift kits and off-road suspension, and their alignment shims are purpose-built to correct the angles that change when you raise a truck or SUV with a Skyjacker lift system.