QA1 RCK52451 G-Body Big Wheel Rear Coilover Kit MOD Series 4-Way Adjustable 200 lb Springs

The QA1 RCK52451 is a bolt-in rear coilover conversion kit engineered for 1978–1988 GM G-Body vehicles. Designed to accommodate up to 24-inch wheels, this "Big Wheel" kit pairs purpose-built mounting hardware with QA1's top-of-the-line MOD Series 4-way adjustable shocks and 12-inch, 200 lb. coil springs—giving drivers precise control over ride height and suspension tuning.

MOD Series QuickTune Technology:

• 4-way adjustable valving — fully independent high-speed and low-speed adjustment for both compression and rebound, with 24 clicks of total adjustment
• QuickTune interchangeable valve packs can be swapped out with a simple hex key while the shock remains on the car, without interrupting the oil path or exposing internals to contamination
• Medium compression and rebound valve packs included standard; soft and firm valve packs available separately
• External nitrogen-charged canister prevents cavitation and maintains consistent damping under extreme use
• Indexable base eyelet with five adjustable positions for flexible installation in tight spaces
• Fully threaded aluminum shock body for maximum strength and durability
• 100% dyno-tested and serialized; proudly made in Lakeville, Minnesota

Kit Features:

• Adjustable ride height — up to 1/2" higher than stock down to 2.25" lower than stock
• Accommodates wheels up to 24" in diameter
• Includes specially designed mounting brackets, MOD Series aluminum shocks, 12" 200 lb. springs, and all necessary hardware
• True bolt-in installation — no cutting or fabrication required
• Sold as a pair
• Note: Lower shock mount bracket may not be compatible with aftermarket rear end housings

Backed by a Limited Lifetime Warranty, the RCK52451 is the ideal upgrade for G-Body builders seeking maximum tunability for pro-touring, drag-and-drive, autocross, or high-performance street use.