QA1 RCK52450 Rear Pro-Coil MOD Series Adjustable Coilover Conversion Kit with 12in. 220lb. Springs

The QA1 RCK52450 is a complete bolt-in rear coilover conversion kit featuring QA1's top-of-the-line MOD Series adjustable aluminum shocks paired with 12-inch, 220 lb/in. springs. Designed as a direct replacement for the factory rear spring-and-shock setup, this kit delivers precision ride height adjustability, aggressive damping tunability, and long-term durability for serious street and track builds.

MOD Series QuickTune Technology:

• Re-valve in minutes without removing the shocks from the car — an industry first
• Dry modular valve packs swap out quickly without interrupting the oil path or exposing internals to contamination
• Double-adjustable design with independent low-speed bleed control for fully independent compression and rebound tuning
• Nitrogen-charged canister available in piggyback or remote configuration to fit tight spaces
• Indexable base eyelet allows repositioning for optimal shock and canister placement
• 100% dyno tested and serialized — proudly made in Lakeville, Minnesota

Ride Height Adjustability:

• Fully threaded aluminum shock body with adjustable brackets
• Achieve up to 1 inch higher than stock or as much as 3 inches lower than stock ride height
• Fine-tune stance without sacrificing handling or suspension travel

Kit Includes:

• Two MOD Series adjustable aluminum rear shocks
• Two 12-inch springs rated at 220 lb/in.
• Specially designed upper and lower mounting brackets
• All necessary mounting hardware

Additional Notes:

• Bolt-in installation — no cutting or welding required
• Lower shock mount bracket may not be compatible with aftermarket rear end housings
• Eligible for QA1's Limited Lifetime Warranty — register at QA1.net/Warranty
• Sold as a complete kit (pair)

Whether you're building a pro-touring Malibu, a drag-prepped Monte Carlo, or a track-ready Cutlass, the QA1 RCK52450 delivers the tunability and performance to match your build goals — straight out of the box.