Koni FSD Spartan Mountain Master IFS Shock

Upgrade the rear suspension performance of your motorhome with the KONI 8805-1009 Frequency Selective Damping (FSD) Rear Shock, designed for Spartan Mountain Master, Spartan K2, Spartan K3, and Tiffin PowerGlide Class A motorhome chassis. These premium KONI FSD shocks are engineered to improve ride comfort, stability, and suspension control—especially important for diesel pusher motorhomes equipped with Reyco Granning, ZF, or I-beam front suspension systems. KONI FSD technology automatically adapts to changing road conditions. The shock remains firm when greater control is needed—such as during cornering, lane changes, and heavy suspension movement—but softens over expansion joints and rough pavement to deliver a smoother ride. A specialized internal valve system helps filter harsh road vibrations before they reach the chassis, reducing driver fatigue while maintaining excellent suspension stability. The result is improved ride comfort, reduced rear suspension bounce, and better highway control for your motorhome.