QA1 R257-170N Triangulated Four-Link Rear Suspension Kit with Narrowed 9-Inch Axle, Double-Adjustable Coilovers, 170 lb/in Springs

The QA1 R257-170N is a complete triangulated four-link rear suspension conversion kit designed for 1970–1981 2nd Gen GM F-Body vehicles. This kit replaces the factory leaf spring rear suspension with a high-performance coilover and 4-link system, pairing QA1's proven triangulated 4-link hardware with a narrowed 9-inch rear housing for enthusiasts seeking a clean, purpose-built installation.

Key Features:

• Triangulated 4-Link Design: Fully engineered to provide ride height, ride quality, and instant center adjustability without link removal for tuning changes
• Double-Adjustable Coilovers: Independent rebound and compression tunability, delivering precise handling control for both street and track use
• 170 lb/in Springs: Matched spring rate for optimal performance across a wide range of driving conditions
• Narrowed 9-Inch Rear Housing: Custom-spec housing included, eliminating the need to source a compatible rear end separately
• Wide Wheel & Tire Clearance: Compatible with standard and mini-tub configurations, supporting up to 12-inch-wide wheels and 335-series tires
• Black Powder-Coated Finish: Durable, corrosion-resistant finish on all tubular components
• Includes Spanner Wrench: For easy ride height adjustment
• Made in the USA: Manufactured in Lakeville, Minnesota

Installation Notes:

• Welding required
• Exhaust modification required — will not work with over-the-axle exhaust routing
• QA1 Subframe Connectors strongly recommended
• Verify wheel and tire fitment on vehicle prior to installation

QA1 double-adjustable shocks are eligible for a best-in-class limited lifetime warranty when registered at QA1.net/warranty. This kit is the ideal solution for builders who want a lowered, aggressive stance with serious performance capability straight out of the box.