This rear leaf spring features a multi-leaf progressive design that operates in three stages to balance ride quality with payload capacity. The primary three leafs are functional under no additional load, providing excellent everyday ride quality. As moderate loads are applied, the secondary leafs engage to support the added weight. When the truck is fully loaded, the bottom overload leaf engages for maximum hauling capacity. This setup allows the truck to maintain ride quality when unloaded without sacrificing payload capability.
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