Description

QA1's 4-link conversion and narrowed Ford 9 in. axle kits are an all-in-one solution that gives you everything you need to get your First-Gen Camaro or Firebird project on the road—fast. QA1 paired their 4-link suspension kit with a custom narrowed 9 in. rear housing for enthusiasts seeking top-tier performance and hassle-free installation. Your time is valuable, so say goodbye to hunting for junkyard rear ends or struggling with endless measurements and mismatched components—every component in this package is tested by QA1 to fit the first time. These QA1 upgrade kits have been engineered to deliver the performance, ride quality, and adjustability you need to handle serious power and aggressive driving—without the hassle of having to outsource each part.

Ultimate shock performance:

Ditch your leaf springs for QA1 MOD Series coilovers, triangulated 4-link suspension and an all-new narrowed 9 in. rear end. QA1's MOD shocks are designed to provide the ultimate in tunability and performance. With their four-way adjustable valving, remote nitrogen canisters, and huge dampening forces, QA1 MOD shocks deliver in any driving scenario.

QA1 4-link kits are fully engineered to provide ride height, ride quality and instant center adjustability. Whether you're after a lowered, aggressive look or need clearance for wider wheels and tires, QA1 systems deliver.

Easy installation:

QA1 is committed to delivering products that make upgrading your car as simple as possible, and their 4-link kits with 9 in. housing are designed for a bolt-on installation, eliminating the need for custom fabrication.

Key Features:

* Narrowed housing to accommodate wide wheel and tire packages in mini tubbed cars
* Fabricated center section engineered for maximum strength and durability
* Formed trailing arm brackets reduce flex under high loads, ensuring your suspension remains rigid
* Heavy-duty 3 in. OD, 1/4 in. wall axle tubes provide the durability needed for high-performance applications
* 31-spline 1541H alloy axles support up to 650 hp, with the housing handling up to 800 hp
* Durable semi-gloss powder coat finish offers long-lasting protection and a clean, sleek look
* Drain plug, fill plug, and Jack Pad come standard to make service a breeze
* Includes T-bolts and housing studs for assembling axle shafts and installing third members
* High-quality roller bearings for smooth operation and long-lasting reliability

Product Overview

Product Overview QA1's all-in-one solution is a perfect upgrade for your 2nd Gen Camaro or Firebird. We've combined our 4-Link Suspension Kit with a QA1 9" rear housing to deliver top-tier performance and easy installation. No more scavenging for parts or struggling with measurements—each component is designed for a perfect fit, tested by QA1 to ensure hassle-free installation. Enjoy the performance, adjustability, and ride quality you need to handle serious power without ease. Eliminate Your Leaf Springs Upgrade from leaf springs to QA1 MOD shocks and triangulated 4-link suspension providing ride height, ride quality, and instant center adjustment for an aggressive stance and added performance. Easy Installation Our 4-Link Kit with 9" housing makes for an easy installation eliminating the need for custom fabrication which gets you on the road faster. Narrowed 9 Housing Fabricated Center Section: Maximized strength and durability Formed Trailing Arm Brackets: Minimize flex under heavy loads Heavy-Duty 3" Axle Tubes: Built for high-performance 31-Spline Axles: Support up to 650HP, with housing rated up to 800HP Durable Powder Coat: Sleek and long-lasting finish Convenient Maintenance: Drain plug, fill plug, and jack pad included T-bolts, studs, and high-quality roller bearings for smooth assembly and operation Helpful Specs 56-1/8 narrowed wheel mounting width Big Ford New Style Torino Flanges for brake compatibility 5x4-3/4 bolt pattern, ideal for a range of wheels x 3 wheel studs for alloy wheels Ultimate Shock Performance QA1 MOD shocks offer 4-way adjustability for the highest demands in performance and tuning Made in the USA QA1 4-link and 9" housings are proudly made in the USA Fitment Notes Confirm wheel and tire fitment before install Center section not included Narrow housing recommended for mini tubs Welding required QA1 Subframe Connectors recommended May need exhaust modification

Features and Benefits

• Complete Kit: Includes QA1’s 9" rear housing and triangulated 4-link, designed for a perfect fit
• Easy Serviceability: Convenient access with a dedicated fill port, drain plug, vent port, and jack plate for easy rear-end maintenance.
• QA1 MOD Shocks: Fine-tune your ride height and handling for a perfect stance and performance in any driving scenario.
• Easy Installation: Bolt-in design with minimal welding required, reducing install time and effort.

Product Details

Brand:	QA1
Description:	QA1 70-81 GM F-Body Mod Series Four Link Narrowed 9in Suspension System
Manufacturer Part Number:	R357-170N
Part Number:	qapR357-170N
Prop 65 - Short Label:	WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov
Prop 65 Yes/No:	Yes
Shock Valving:	MOD Series
Spring Rate:	170lb/in.
Title:	QA1 Suspension Kit R357-170N
UPC:	00806990230669

Kit Options

This item is available as a full kit.
Select a kit option in the following table if you are looking for this item in a bundle form with all associated components.

Kit option/s:

Thumb	SKU	Kit Title
	qapHK43-GMF2	QA1 Level 3 Full Vehicle Handling Suspension Kits for 1970-1974 CAMARO, FIREBIRD - HK43-GMF2 Kits, 3.0 Drag Kit, Front/Rear Shocks, Coil Springs, Front/Rear Sway Bar, Trailing Arms, Control Arms. Chevy, Pontiac, Kit

Data: v4.2 - Upd: 2026-09-29 16:15:06

Features

Specifications

Product Attributes - Brand

QA1

Product Attributes - Manufacturer's Part Number

R357-170N

Product Attributes - Part Type

Rear Suspension Packages

Product Attributes - Product Line

QA1 Four Link Conversion and Narrowed Ford 9 in. Axle Kits

Product Attributes - UPC

806990230669

Product Attributes - Third Member Included

No

Product Attributes - Third Member Case Style

Ford 9 inch

Product Attributes - Axle Shafts Included

Yes

Product Attributes - Axle Shaft Spline Quantity

31

Product Attributes - Upper Control Arms Included

No

Product Attributes - Lower Control Arms Included

No

Product Attributes - Air Bags Included

No

Product Attributes - Rear Shocks/Struts Included

Yes

Product Attributes - Rear Shock Type

Double adjustable coilover

Product Attributes - Coilover Springs Included

Yes

Product Attributes - Coilover Spring Rate (lbs/in)

170 lbs./in.

Product Attributes - Spring Finish

Gray/Silver

Product Attributes - Suspension Package Finish

Black powdercoated

Product Attributes - Bushings Included

Yes

Product Attributes - Bushing Material

Spherical bearing

Product Attributes - Bushing Color

Natural

Product Attributes - Sway Bar Included

No

Product Attributes - Watts Link Included

No

Product Attributes - Panhard Bar Included

No

Product Attributes - Adjustable Panhard Bar Included

No

Product Attributes - Upper Trailing Arms Included

Yes

Product Attributes - Adjustable Upper Trailing Arms Included

Yes

Product Attributes - Adjustable Upper Trailing Arms Type

Double adjustable

Product Attributes - Lower Trailing Arms Included

Yes

Product Attributes - Adjustable Lower Trailing Arms Included

Yes

Product Attributes - Adjustable Lower Trailing Arms Type

Single adjustable

Product Attributes - Trailing Arm Mount Braces Included

Yes

Product Attributes - Trailing Arm Hardware Included

Yes

Product Attributes - Rotors Included

No

Product Attributes - Calipers Included

No

Product Attributes - Quantity

Sold as a kit.

Product Attributes - Special Attention

Axle is narrowed to accomodate wider wheel and tire packages in mini tubbed applications. Requires third member for Ford 9 in. housings with 31 spline axles.

Compatibility