The Dayton Parts Twisted Z Leaf Spring for Kenworth / Peterbilt. This leaf spring boasts a full taper design With a spring width of 3.00" and a single leaf construction. With a spring pack thickness of 2.18", this leaf spring has a high load capacity of 20,000 lbs at the pad. But that's not all this leaf spring also comes with a front bushing included, saving you time and effort in sourcing and installing it separately. With its durable construction and high load capacity, the Twisted Z Leaf Spring is the perfect choice for heavy duty trucks that need reliable suspension components. Upgrade your ride with the Twisted Z Leaf Spring today. FleetPride is your First Click in Heavy Duty®.