QA1 RCK52462 Rear Pro Coil MOD Series Coilover Kit 71-76 GM B-Body 300 lb Springs

The QA1 RCK52462 is a Big Wheel Rear Pro Coil conversion kit engineered for 1971–1976 GM B-Body vehicles. Built around QA1's flagship MOD Series shocks, this kit delivers the ultimate combination of street drivability and high-horsepower drag strip performance in a complete, bolt-in package.

At the heart of this system is QA1's QuickTune Technology — an industry-first design featuring dry modular valve packs that can be swapped out in minutes while the shock remains mounted on the vehicle. This allows for complete revalving without interrupting the oil path or exposing the shock internals to air and debris contamination. Four-way independent adjustability of both high- and low-speed compression and rebound lets you dial in the exact feel you need, from daily street driving to competitive drag racing or pro-touring events.

The shocks feature a fully threaded aluminum body paired with adjustable mounting brackets, providing meaningful ride height adjustability to achieve your desired stance. Included 300 lb/in springs are rated for high-horsepower applications where chassis control is critical.

Key Features:

• MOD Series shocks with QuickTune Technology for tool-free revalving on the car
• Four-way adjustable valving — independent high and low speed compression and rebound tuning
• Remote nitrogen canisters for consistent, fade-resistant damping performance
• Fully threaded aluminum shock body for ride height adjustability
• 300 lb/in spring rate — optimized for high-horsepower street and strip builds
• Includes specially designed USA-made mounting brackets, shocks, springs, and all hardware
• Bolt-in installation — no cutting or fabrication required
• Sold as a pair
• Limited Lifetime Warranty (registration required at QA1.net/Warranty)
• Proudly made in the USA in Lakeville, Minnesota

Note: The lower shock mount bracket may not be compatible with aftermarket rear end housings. A spanner wrench is required for installation.