Leaf Spring

Leaf springs are multi-layered steel springs that support vehicle weight and absorb road impacts in trucks, vans, and heavy-duty vehicles. The main leaf carries the primary load while additional leaves provide progressive spring rates, with the assembly mounted between the axle and frame through front eyes and rear shackles.

Failed leaf springs cause sagging rear end, uneven tire wear, harsh ride quality, bottoming out over bumps, vehicle leaning to one side, and metal-on-metal clunking sounds during acceleration or braking when leaves separate or break.

Leaf spring assemblies work closely with their mounting hardware and bushings to maintain proper suspension geometry. The leaf spring bushings at the front eye and rear shackle bushings absorb vibration and allow natural spring flex, while worn bushings cause the springs to bind and wear prematurely. Many vehicles also pair leaf springs with shock absorbers that control spring oscillation, and replacing both together ensures optimal ride control and prevents rapid shock wear from working against sagging springs.

Choose complete leaf spring assemblies that match your vehicle's load rating and leaf count. OE-specification springs maintain proper ride height and load capacity, while heavy-duty options offer increased payload for commercial use. Replace springs in pairs to maintain even ride height and handling, and inspect all mounting hardware during installation.

How do leaf springs support vehicle weight and provide suspension?

Leaf springs use multiple curved steel leaves stacked together to create a flexible beam that supports the vehicle's weight while allowing vertical movement. The main leaf connects to the frame through front and rear mounting points, while additional leaves provide progressive spring rates that increase resistance as load increases.

What are the signs that leaf springs need replacement?

Watch for sagging rear end or uneven ride height, harsh bouncing over bumps, bottoming out with normal loads, uneven tire wear patterns, vehicle pulling or leaning to one side, and metallic clunking or squeaking noises during acceleration, braking, or over bumps.

Should I replace leaf springs in pairs even if only one side is sagging?

Yes, always replace leaf springs in pairs to maintain even ride height, balanced handling, and prevent premature wear of the new spring. Mismatched spring rates cause uneven weight distribution, poor handling characteristics, and accelerated tire wear on the vehicle's suspension and steering components.