QA1 R370-150 HD Pro Rear Drag 4-Link Suspension System with MOD Shocks & 150lb Springs

The QA1 R370-150 HD Pro Rear Drag 4-Link System is a complete, bolt-in rear suspension solution engineered for serious drag racing applications. This comprehensive kit replaces factory leaf spring or multi-link setups with a proven 4-link configuration that delivers consistent, repeatable launches and improved weight transfer for maximum traction at the strip.

The system pairs QA1's heavy-duty MOD series coilover shocks with 150 lb/in rate springs, providing the firm, controlled compression needed to plant the rear tires hard off the line. The 4-link geometry allows precise pinion angle adjustment, letting racers fine-tune suspension wrap and anti-squat characteristics without cutting or welding the chassis.

Kit Includes:

• Upper and lower 4-link mounting brackets
• Upper and lower trailing arms
• Diagonal link kit for triangulation and lateral stability
• QA1 MOD series coilover shocks (pair)
• 150 lb/in coilover springs
• Shock crossmember
• Tube adapters for arm length adjustment
• QA1 high-misalignment rod ends
• All necessary hardware for installation

Key Features:

• Heavy-duty steel construction for high-horsepower drag racing environments
• Fully adjustable 4-link geometry for anti-squat and pinion angle tuning
• QA1 MOD shocks with external adjustment for compression damping
• Rod end joints allow articulation and prevent binding under load
• Compatible with standard chassis dimensions for popular domestic performance vehicles
• Designed for consistent, repeatable 60-foot times

Whether you're building a dedicated race car or a dual-purpose street/strip machine, the QA1 R370-150 4-Link System provides the foundation for a serious rear suspension setup that can be tuned as your combination evolves.