Leaf Spring Shims 1pr 4 Degree

Leaf spring shims 1pr 4 degree from Mr. Gasket are precision-engineered alignment tools designed for custom suspension geometry tuning on vehicles with leaf spring rear suspensions. Whether you're lowering a classic truck, adjusting anti-squat characteristics on a performance build, or correcting suspension rake after modifications, these aluminum shims provide repeatable, adjustable geometry changes without permanent frame alterations. A single pair delivers 4 degrees of adjustment, making them essential for builders and mechanics who demand tuning flexibility.

Manufactured from durable aluminum and finished in natural (uncoated) form, these shims measure 2 inches in width and install between the leaf spring pack and axle perch. The 4-degree geometry shift influences pinion angle, weight transfer bias, and ride height relationship—critical variables in lowered or lifted suspensions where factory perch angles no longer suit the modified ride height. At just 0.5 lbs per pair, they add negligible weight while enabling independent control of rear suspension angle without modifying welded frame components or requiring custom fabrication.

Mechanics and enthusiasts working on vintage trucks, hot rods, and street machines rely on leaf spring shims to dial in driveline angle, minimize vibration transmission, and optimize weight distribution during acceleration or deceleration. Installation is straightforward—remove the spring-to-axle U-bolts, insert the shims under the spring perch, and reinstall hardware. These shims stack, allowing cumulative geometry adjustment if multiple pairs are used. Compatible with any vehicle featuring traditional leaf spring rear suspension where axle-to-frame perch height adjustment is needed.