QA1 RCK52461 Big Wheel Rear Pro Coil MOD Series Coilover Conversion Kit 250 lb. Springs

The QA1 RCK52461 is a Big Wheel Rear Pro Coil coilover conversion kit purpose-built for 1971–1976 GM B-Body vehicles including the Impala and Caprice. Featuring QA1's top-of-the-line MOD Series shocks, this kit delivers the ultimate combination of adjustable ride height and high-performance shock tunability — whether you're building a Donk with large wheels or a high-horsepower street or drag car.

Adjustable Ride Height

The fully threaded aluminum coilover body and adjustable mounting brackets provide a wide range of rear ride height adjustment, from stock height down to approximately 5 inches of drop. This adjustability makes it easy to accommodate large wheel-and-tire packages, including fitment of up to 28" wheels.

MOD Series Shocks with QuickTune Technology

The included MOD Series aluminum shocks feature dry modular valve packs that can be swapped out quickly — even while the shock remains on the vehicle — without opening the shock body or contaminating the oil path. Medium compression and rebound valve packs are included as standard, with additional packs available separately for further tuning.

Key Features:

• MOD Series adjustable aluminum shocks with QuickTune modular valve pack technology
• 250 lb./in. high-travel coilover springs included
• Adjustable rear ride height from stock down to approximately 5" of drop
• Designed to accommodate up to 28" wheels
• Compatible with factory rear housings or Quick Performance 9" rear axles
• Includes specially designed mounting brackets and all necessary hardware
• Powder-coated components — ready to install out of the box
• No cutting, grinding, or welding required — true bolt-in installation
• Made in the USA
• MOD Series shocks eligible for QA1's Limited Lifetime Warranty

This kit arrives complete and ready to bolt in at home or at your local shop, making it one of the easiest paths to a fully adjustable coilover rear suspension on a classic GM B-Body platform.