QA1 GS507-10400C GM Pro-Coil Single-Adjustable Aluminum Shock Kit 10" 400 lb/in Tapered Flat Large

The QA1 GS507-10400C is a front Pro-Coil single-adjustable coilover shock kit designed as a stock-mount replacement for GM applications. Built around QA1's aluminum shock body construction, this kit delivers a significant upgrade over OEM suspension with tunable damping and a matched coil spring for improved handling, ride quality, and performance on the street or strip.

Key Features:

• Single-Adjustable Damping: Tool-adjustable compression and rebound tuning allows the driver to dial in ride characteristics without removing the shock
• Aluminum Shock Body: Lightweight, corrosion-resistant aluminum construction reduces unsprung weight compared to steel-bodied alternatives
• Stock Mount Design: Direct bolt-in fitment using factory mounting locations — no custom fabrication required
• Included 10" Spring at 400 lb/in Rate: Tapered flat-wound large-diameter coil spring provides a firm, performance-oriented spring rate appropriate for high-performance street and drag racing use
• Compressed Length: 9.63 inches
• Extended Length: 14.5 inches
• Spring Configuration: 10-inch length, 400 lb/in rate, tapered flat wound, large diameter

QA1's Pro-Coil system is engineered for enthusiasts seeking a complete, performance-ready front suspension upgrade that installs cleanly into existing GM mounting points. The single-adjustable shock provides a meaningful step up from factory dampers, making this kit a popular choice for street machines, drag cars, and weekend track vehicles.