QA1 DS501-12300 HD Pro Rear Coilover Conversion System 3.0" Axle Single Adjustable 300lb Spring

The QA1 DS501-12300 HD Pro Rear Coilover Conversion System is a complete, heavy-duty solution designed to upgrade your vehicle's rear suspension from a factory leaf spring or stock setup to a modern coilover configuration. Engineered by QA1 Precision Products — a trusted name in performance suspension and driveline components — this system delivers improved handling, adjustability, and ride quality for street performance and racing applications.

Kit Contents:

• Two (2) single-adjustable coilover shocks
• Two (2) 300 lb/in rate coil springs
• One (1) 40-inch weld-in mounting tube (3.0" axle diameter fitment)
• All necessary mounting hardware

Key Features:

• Single-Adjustable Shocks: Rebound damping is tunable to dial in ride quality and handling balance for your specific application
• 300 lb/in Spring Rate: A firm, performance-oriented spring rate suited for modified street and track builds
• 3.0" Axle Tube Compatibility: The included 40" weld-in tube is sized specifically for 3.0-inch diameter rear axle housings
• Weld-In Design: Provides a strong, permanent mounting solution for a clean and robust coilover installation
• Complete Conversion Kit: Everything needed for the coilover conversion is included in one package, minimizing additional part sourcing
• QA1 Precision Engineering: Built to strict tolerances for reliable, repeatable performance

The QA1 DS501-12300 is ideal for builders looking to modernize their rear suspension with a proven coilover system. Whether you're building a street rod, muscle car, or dedicated race car, this kit provides the foundation for a tunable, high-performance rear suspension setup.