QA1 RCK52454 Rear Pro-Coil MOD-Series Adjustable Coilover Kit 12in. 300lb. Springs

The QA1 RCK52454 is a bolt-in rear coilover conversion kit designed for 1978–1996 GM B-Body vehicles. Built for enthusiasts who demand the ultimate in suspension tunability, this kit pairs QA1's top-of-the-line MOD Series shocks with 12-inch, 300 lb/in rate springs for a complete rear suspension upgrade — no cutting or welding required.

MOD Series QuickTune Technology:

The MOD Series shock features QA1's exclusive QuickTune Technology — dry modular valve packs that can be swapped out in minutes while the shock remains mounted on the vehicle. This industry-first design allows complete revalving without interrupting the oil path or exposing the shock internals to debris or air contamination. Designed specifically for high-performance drag racing and pro-touring applications, the MOD shock delivers 4-way adjustable valving with independent control of both high-speed and low-speed compression and rebound damping.

Key Features:

• MOD Series 4-way adjustable shocks — independent high and low speed compression and rebound tuning
• QuickTune valve packs — swap valving in minutes without removing shocks from the vehicle
• Fully threaded aluminum shock body with adjustable mounting brackets for precise ride height tuning
• 12-inch, 300 lb/in springs included — suitable for performance street and track use
• Bolt-in installation — no cutting or welding required
• 100% dyno tested and serialized at the factory
• Rebuildable and revalveable by QA1 or authorized service centers
• Proudly made in the USA (Lakeville, Minnesota)
• Limited Lifetime Warranty (registration required at QA1.net/Warranty)

Kit Includes:

• 2 MOD Series coilover shocks
• 2 high-travel 12-inch springs (300 lb/in spring rate)
• All mounting brackets and hardware

Note: Lower shock mount bracket may not be compatible with aftermarket rear end housings.