QA1 RCK52383 Rear Pro-Coil Coilover Conversion Kit Single Adjustable 200 lb/in Springs

The QA1 RCK52383 is a complete bolt-in rear coilover conversion kit designed for 1978–1996 GM B-Body full-size cars. This Pro-Coil system replaces the factory rear suspension with performance-tuned aluminum shocks and high-travel coil springs, delivering a significant upgrade in ride quality and handling without cutting or welding.

The single-adjustable shocks feature a fully threaded body and offer 18 positions of simultaneous rebound and compression adjustment, allowing you to fine-tune the suspension for anything from casual street driving to spirited performance use. Ride height is easily adjusted via the threaded shock body for the perfect stance and improved weight balance.

The included 12-inch, 200 lb/in high-travel springs are specially designed for QA1's Pro Coil systems. Their fewer coils and smaller wire diameter create greater distance between coils, resulting in increased suspension travel, reduced unsprung weight, and faster response compared to standard coil springs.

Kit Includes:

• 2 single-adjustable aluminum coilover shocks
• 2 high-travel 12-inch coil springs — 200 lb/in spring rate
• Specially designed USA-made mounting brackets
• All necessary hardware for installation

Key Features:

• Bolt-in installation — no cutting or welding required
• 18-position simultaneous rebound and compression adjustment
• Fully threaded shock body for ride height adjustability
• 100% dyno tested and serialized from the factory
• Rebuildable and revalveable by QA1 or authorized service centers
• Backed by a 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. Later model B-Body vehicles tend to weigh more on average — consider spring rate selection accordingly.