QA1 R357-170S Four-Link Kit with OE Width 9in. Rear Housing MOD Series

The QA1 R357-170S is a complete four-link rear suspension conversion kit paired with a QA1 OE-width 9" rear housing, engineered for 2nd Gen GM F-Body muscle car builders who want top-tier performance without the hassle of sourcing mismatched components. This all-inclusive MOD Series package replaces factory leaf springs with a triangulated 4-link geometry and QA1 MOD Series coilovers, delivering precise ride height, ride quality, and instant-center adjustability out of the box.

Key Features:

• Complete Kit: Includes QA1's 9" OE-width rear housing and triangulated 4-link suspension — everything engineered and tested to fit together correctly the first time
• High-Strength Axle Tubes: Heavy-duty 3" OD, ¼" wall axle tubes built for high-performance applications
• 31-Spline 1541H Alloy Axles: Rated to support up to 650HP, with the housing capable of handling up to 800HP
• QA1 MOD Series Coilovers: Fine-tune ride height and handling with premium adjustable shocks for any driving scenario
• Easy Serviceability: Dedicated fill port, drain plug, vent port, and jack plate provide convenient access for rear-end maintenance
• Wide Wheel & Tire Clearance: Compatible with standard and mini-tub configurations, supporting up to 12-inch-wide wheels and 335-width tires
• Fabricated Center Section: Engineered for maximum strength and durability under serious power
• Formed Trailing Arm Brackets: Reduce flex under high loads to keep the suspension geometry rigid and consistent
• Made in the USA: Manufactured in Lakeville, Minnesota
• Lifetime Warranty: QA1 MOD Series shocks are backed by a best-in-class lifetime warranty (registration required at QA1.net/warranty)

Ride Height: Typical range from axle centerline to fender arch is 10.75"–12" for Camaro applications and 13.75"–15" for Firebird applications.

Installation Notes: Welding is required. QA1 Subframe Connectors are strongly recommended. Exhaust modification may be required; kit will not work with over-the-axle exhaust. Includes spanner wrench. Verify wheel and tire fitment on the vehicle prior to installation.