QA1 R356-170N Four-Link Suspension Conversion Kit with Narrowed 9" Rear End MOD Series

The QA1 R356-170N is a complete rear suspension conversion system built for the 1967–1969 GM F-Body platform. This MOD Series four-link kit pairs QA1's triangulated 4-link suspension with a custom-built narrowed 9" rear housing, giving you everything needed to ditch your factory leaf springs in a single, fully engineered package.

Engineered as a bolt-on solution, the R356-170N is designed for straightforward installation with no custom fabrication required. Every component in the kit is tested by QA1 to ensure proper fitment right out of the box. Adjusting ride height, pinion angle, or wheelbase requires only minor tweaks—no link removal needed—and no modifications to the floor pan are required.

Key Features:

• QA1 MOD Series Coilovers with four-way adjustable valving for independent tuning of high and low speed compression and rebound, plus remote nitrogen canisters
• Triangulated 4-link suspension fully engineered for ride height, ride quality, and instant center adjustability
• Custom Narrowed 9" Rear Housing with a fabricated center section engineered for maximum strength and durability
• Heavy-duty 3" OD, 1/4" wall axle tubes built for high-performance applications
• 31-spline 1541H alloy axles supporting up to 650HP; housing rated up to 800HP
• Formed trailing arm brackets reduce flex under high loads for a rigid suspension
• Ride height adjustability of +2 to -3 inches for dialing in your desired stance
• Durable semi-gloss powder coat finish for long-lasting protection and clean aesthetics
• Drain plug, fill plug, and jack pad included for easy serviceability
• T-bolts and housing studs included for axle shaft assembly and third member installation
• High-quality roller bearings for smooth operation and long-term reliability
• Big Ford "New Style Torino Flanges" with 2.5" axle offset for broad brake compatibility
• 5x4-3/4" factory bolt pattern for a wide range of wheel fitment options

The R356-170N is proudly designed and manufactured in Lakeville, Minnesota. Whether you're building a track-ready restomod or a high-powered street machine, this complete conversion system delivers the performance, adjustability, and reliability your build demands.