QA1 RCK52448 Rear Pro-Coil MOD Series Coilover Conversion Kit 1978-1988 GM G-Body 170lb Springs

The QA1 RCK52448 is a bolt-in rear coilover conversion kit engineered for 1978–1988 GM G-Body vehicles, including the Malibu, Monte Carlo, Cutlass, and similar platforms. This complete system replaces the factory rear suspension with a fully adjustable coilover setup capable of achieving ride heights from 1 inch above stock down to 3 inches below stock.

At the heart of this kit are QA1's MOD Series adjustable aluminum shocks, featuring the brand's exclusive QuickTune Technology—dry modular valve packs that can be swapped out in minutes while the shock remains mounted on the vehicle. This allows for rapid revalving without interrupting the oil path or exposing the shock internals to debris or air contamination. Medium compression and rebound valve packs are included as standard, with soft and firm packs available separately.

Key Features:

• Bolt-in rear coilover conversion — no cutting or welding required
• MOD Series double-adjustable shocks with independent compression and rebound control (24-click adjustment)
• Low-speed valving adjustability for fine-tuning ride quality and weight transfer on corner entry and exit
• High-speed valving adjustment for coarse control during impact events such as potholes or curbs
• Large solid piston with blow-off valve for improved driver feel and control — up to 1,600 lb. force
• Fully threaded aluminum shock body with adjustable brackets for precise ride height tuning
• Nitrogen-charged canister available in piggyback or remote configuration for installation flexibility
• Indexable base eyelet with multiple mounting positions to optimize knob access and canister placement
• 12-inch springs with a 170 lb/in spring rate included
• Ride height range: 1 inch above stock to 3 inches below stock
• USA-made mounting brackets included
• All necessary mounting hardware included
• 100% dyno tested and serialized
• Made in Lakeville, Minnesota, USA

This kit is an excellent choice for G-Body owners seeking improved stance, ride quality, and handling performance — whether on the street or the track. The MOD Series platform delivers an expansive force curve capability and an unprecedented level of tunability for drag racing, pro-touring, or spirited street driving.