QA1 Suspension System R545-200N

Upgrade the rear suspension of your 1999-2006 Chevrolet Silverado with a complete QA1 Rear Suspension System, paired with a narrowed 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 more flexibility for modern wheel and tire fitment. The narrowed housing is designed to complement mini-tubbed trucks while opening up more options for wheel fitment. The result is greater freedom to choose from readily available wheels and create the stance and look you want. MORE WHEEL OPTIONS, BETTER FITMENT The included 9-inch housing features a 62-1/2" wheel mounting surface width, 5-3/4" narrower overall than the factory 68-1/4" width. The narrowed design works with mini-tubs to give you greater flexibility in wheel width, backspacing and offset, making it easier to achieve the aggressive look to match the performance. 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 narrowed 9-inch housing and 31-spline axles to simplify your build. 

• More wheel and tire options: Narrowed 9-inch housing provides an additional 2-7/8" per side for mini-tub applications.
• 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, narrowed 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.