QA1 RCK52613 Rear Coil-Over Conversion System Single Adjustable 250 lb/in Springs with Panhard Bar

QA1's RCK52613 is a bolt-on rear coil-over conversion system engineered for 1963–1972 Chevrolet C10 trucks originally equipped with a coil-spring rear suspension. Designed to retain your factory truck arms while upgrading to adjustable coil-overs, this system delivers a significant improvement in ride height control, cornering stability, and overall handling performance.

The coil-overs are relocated to the outside of the frame rail, positioning them closer to the wheel for improved suspension leverage and cornering stability. This relocation also frees up clearance for popular aftermarket rear-mounted fuel tanks. The system includes single adjustable coil-over shocks paired with high-travel 250 lb/in springs, and all shocks are 100% dyno-tested and serialized at the factory.

Key Features:

• Converts factory coil-spring rear suspension to adjustable coil-overs
• Single adjustable shock valving for customizable ride quality and performance
• 250 lb/in high-travel coil-over springs included
• Ride height adjustable at each corner for precise stance tuning
• Full-length adjustable panhard bar keeps the rear axle centered for predictable cornering
• Multiple panhard bar mounting locations correct roll center geometry based on amount of drop
• Coil-overs relocated outside the frame rail — closer to the wheel — for enhanced cornering stability
• Provides clearance for popular aftermarket rear-mounted fuel tanks
• Bolt-on installation — no welding required, and the bed does not need to be removed
• Retains factory truck arms — ideal for builders looking to keep OEM components
• All components proudly made in the USA

This system integrates adjustability into multiple areas, allowing builders to fine-tune suspension geometry to achieve the perfect stance and performance after lowering. The complete kit includes all necessary hardware for a straightforward installation. QA1 backs select shock absorbers with a limited lifetime warranty.