QA1 RCK52617 Rear Coilover Conversion Kit with Panhard Bar, Double Adjustable, 12in. 250lb. Springs

The QA1 RCK52617 is a bolt-on rear coilover conversion system engineered for 1963–1972 GM C10 trucks that retain their factory control arms. This kit replaces the stock coil-spring rear suspension with performance coilover shocks, giving you per-corner ride height adjustability for the ideal stance and handling balance.

Double Adjustable Damping

This kit features QA1's double adjustable Pro Coil shocks, which allow independent tuning of both compression and rebound damping from separate adjustment knobs. Fine-tune the suspension for street cruising or spirited driving without compromising either setting. All shocks are 100% dyno-tested and serialized at the factory.

Adjustable Panhard Bar

The included full-length, adjustable panhard bar keeps the rear axle properly centered under the chassis after lowering. Multiple mounting locations correct roll center geometry based on the amount of drop, maintaining predictable cornering behavior and minimizing rear steer.

Optimized Coilover Placement

The coilovers are relocated to the outside of the frame rail, positioning them closer to the wheel for improved cornering stability. This also frees up space behind the cab, making the system compatible with popular aftermarket rear-mounted fuel tanks.

Key Features:

• Bolt-on rear coilover conversion — retains factory truck control arms
• Double adjustable shocks with independent compression and rebound tuning
• 12-inch, 250 lb/in. high-travel springs for performance lowering
• Per-corner ride height adjustability for precise stance tuning
• Full-length adjustable panhard bar with multiple mounting locations
• Coilovers relocated outside frame rail for improved handling and fuel tank clearance
• 100% dyno-tested and serialized shocks
• Made in the USA

The QA1 RCK52617 is the ideal upgrade for builders who want to keep their factory C10 rear suspension geometry while gaining the ride height control, cornering performance, and damping adjustability of a true coilover system.