QA1 Suspension System R545-200S

Upgrade the rear suspension of your 1999-2006 Chevrolet Silverado with a complete QA1 Rear Suspension System, paired with a standard-width 9-inch housing, 31-spline axles and 4-way adjustable MOD Series shocks. Designed for short-bed trucks, this system combines serious suspension tuning capability with straightforward wheel and tire fitment. The standard-width housing maintains the factory 68-1/4" wheel mounting surface width, making it easy to build around common wheel and tire combinations without narrowing the rear end. FACTORY WIDTH FOR EASY WHEEL FITMENT The included 9-inch housing features a 68-1/4" wheel mounting surface width that matches the factory width. This makes wheel and tire selection more straightforward while maintaining the factory rear track width. The housing includes 31-spline axles, Big Ford New Style Torino housing ends and the factory 6x5.5" bolt pattern for compatibility with a wide range of brake and wheel combinations. MODERN COIL-OVER PERFORMANCE Replace the factory rear suspension with a performance-focused coil-over system designed to improve suspension control and give your NBS a more responsive, modern driving experience. COMPLETE SYSTEM WITH 9-INCH HOUSING Get the suspension and rear-end components you need in one matched package. The system combines QA1 rear suspension components, 4-way adjustable MOD Series shocks, 200 lb/in. springs, a standard-width 9-inch housing and 31-spline axles to simplify your build. 

• Easy wheel and tire fitment: Standard 68-1/4" wheel mounting surface width maintains the factory rear track width.
• Take control with 4-way adjustability: Independently tune high-speed and low-speed compression and rebound to dial in ride quality, handling and traction.
• Tune for the street or track: Separate damping adjustments let you optimize suspension behavior for different driving conditions and performance goals.
• Expand your tuning range: QuickTune valve packs allow internal valving changes without removing the shocks from the truck.
• Build around your preferred wheels and brakes: Factory 6x5.5" bolt pattern and Big Ford New Style Torino housing ends provide compatibility with a wide range of combinations.
• Start with a complete, matched system: Suspension components, MOD Series shocks, standard-width 9-inch housing and 31-spline axles are packaged together to simplify your build.
• Performance you can count on: QA1 shocks are 100% dyno tested and serialized.