QA1 RCK52394 Rear Pro-Coil MOD Series Coilover Conversion Kit 220 lb. Springs

The QA1 RCK52394 is a bolt-in rear coilover conversion kit featuring QA1's top-of-the-line MOD Series shocks and 220 lb./in. high-travel springs, purpose-built for 1965–1970 Chevy B-Body full-size cars. This complete kit eliminates the factory rear shock and spring setup and replaces it with a fully adjustable coilover system — no cutting or welding required.

At the heart of this kit are QA1's multi-patent-pending MOD Series shocks, the most tuneable shocks in QA1's lineup. Featuring QuickTune Technology, the dry modular valve packs can be swapped out in minutes while the shock remains on the car, allowing for instant revalving without interrupting the oil path or exposing internals to debris or air contamination. Medium compression and rebound valve packs are included as standard, with soft and firm packs available separately.

The MOD Series shocks feature a double adjustable design with adjustable low-speed bleed, providing fully independent control over compression and rebound characteristics. Combined with the fully threaded aluminum shock body, this allows for precise ride height and handling tuning whether you're building a pro-touring street machine or a dedicated track car.

Kit Includes:

• 2 MOD Series adjustable aluminum shocks
• 2 high-travel 220 lb./in. springs
• Specially designed USA-made mounting brackets
• All necessary mounting hardware

Key Features:

• Bolt-in installation — no cutting or welding required
• Fully threaded aluminum shock body for ride height adjustability
• QuickTune Technology for tool-free, on-car revalving
• Independent compression and rebound adjustment with adjustable low-speed bleed
• Lightweight high-travel springs with reduced unsprung weight for faster suspension response
• 100% dyno tested and serialized
• Proudly made in the USA in Lakeville, Minnesota
• Limited lifetime warranty on shocks (registration required at QA1.net/Warranty)

The QA1 Pro-Coil rear coilover system pairs perfectly with QA1's adjustable front coilover kits, making it possible to upgrade the entire suspension system front to rear for a complete performance transformation.