QA1 RCK52393 Rear Pro-Coil MOD Series Coilover Kit 200 lb/in Spring Rate

The QA1 RCK52393 is a bolt-in rear coil-over conversion kit featuring QA1's advanced MOD Series shock technology, purpose-built for 1965–1970 Chevy B-Body platforms. This complete kit eliminates the factory rear spring setup and replaces it with a fully adjustable, performance-tuned coilover system — with no cutting or welding required.

At the heart of this kit are QA1's MOD Series aluminum shocks, which feature QuickTune Technology — a dry modular valve pack system that allows complete revalving in minutes without removing the shocks from the vehicle, interrupting the oil path, or compromising the nitrogen charge. Medium compression and rebound valve packs come standard, with optional soft or firm packs available separately. Once valving is set, the double-adjustable design provides fully independent control over compression and rebound characteristics for an unprecedented range of tuning capability.

Kit Features:

• MOD Series Double-Adjustable Aluminum Shocks — independent compression and rebound tuning with 18 positions each (324 total combinations)
• 200 lb/in High-Travel Springs — American-made lightweight design with fewer coils and smaller wire diameter for increased travel and reduced unsprung weight
• Fully Threaded Shock Body — allows ride height adjustment for custom stance or fine weight-balance tuning
• Nitrogen-Charged Canister — available in piggyback or remote configuration; indexable base eyelet for flexible mounting angles
• Bolt-In Installation — includes all USA-made mounting brackets and hardware; no cutting or welding required
• 100% Dyno Tested and Serialized — every shock verified at the factory before shipment
• Rebuildable and Revalveable — serviceable by QA1 factory or authorized service centers
• Proudly made in the USA in Lakeville, Minnesota

Kit Includes:

• 2 MOD Series Aluminum Shocks
• 2 High-Travel Springs (200 lb/in spring rate)
• All Mounting Brackets and Hardware

This rear coilover system is an ideal upgrade for street performance, pro-touring, and drag race builds. When paired with QA1's front coilover system, it delivers a complete end-to-end suspension transformation for your classic B-Body. Note: Lower shock mount bracket may not be compatible with aftermarket rear end housings.