Rear Shock Asborber FSD Series

The KONI Rear Shock Absorber FSD Series is a purpose-built replacement rear shock for Ford full-size trucks from 1999 to 2007, engineered to restore or enhance suspension performance on vehicles equipped with the Ford V10 engine platform. This twin-tube design addresses the demanding load requirements of heavy-duty truck frames, providing consistent damping control whether your truck is used for towing, hauling, or daily driving. As a mechanic, you'll recognize that OEM shocks on these trucks lose responsiveness after 80,000–100,000 miles, leading to excessive body roll, poor braking stability, and uneven tire wear.

The FSD twin-tube construction uses a sealed steel body with precision-calibrated internal valving to manage both compression and rebound forces independently. The distinctive gold paint finish protects against corrosion while signaling the shock's premium tuning—each piston rod is chrome-plated to resist contamination in off-road or high-mileage applications. At 7.7 pounds per unit and measuring 31.25 inches in length with a 3-inch diameter body, this shock integrates directly into the rear axle mounting points without modification, delivering predictable damping rates across varied load conditions and road surfaces. The twin-tube design also provides superior heat dissipation compared to monotube alternatives, maintaining consistent performance during extended towing or mountain driving.

Fleet operators, truck builders, and restoration specialists benefit most from this shock's reliability and longevity—it's a bolt-in replacement that eliminates the need for custom fabrication or suspension geometry adjustments. Installation requires no spring preload changes or bracket modifications on 1999–2007 Ford full-size trucks; simply unbolt the worn OEM unit and install the FSD in its place. For vehicles regularly towing trailers or carrying heavy payload, upgrading both rear shocks ensures balanced suspension control and reduces stress on frame components, ultimately extending the life of bearings, bushings, and mounting hardware.