QA1 HK02-FM01RS Level 2 Handling Kit w/ 9" housing, 64-66 Mustang

Transform your classic Mustang into a modern-handling street machine with QA1’s Level 2 Full Vehicle Handling Kit. Designed specifically for 1964–1966 Mustangs, this system replaces outdated factory suspension with a complete bolt-on package - engineered for balance, adjustability, and ride comfort. From the front control arms to the rear 4-link and 9” housing, every component works together to deliver sharper steering, better traction, and a perfectly tuned stance.

MODERN PERFORMANCE, CLASSIC STYLE

Factory leaf springs and stamped steel components limit performance and ride quality. QA1’s complete suspension system updates your Mustang with modern geometry, adjustable coilovers, and tubular construction that drastically improves handling without compromising ride comfort. The included 9” housing integrates seamlessly with QA1’s triangulated 4-link to create a unified, high-strength foundation ready for serious power.

HANDLING YOU CAN DIAL IN

This Level 2 system includes double adjustable coilovers that allow independent control over compression and rebound, so you can fine-tune ride quality and performance for your exact driving style - whether that’s highway cruising or weekend corner carving.

FRONT-TO-REAR BALANCE

The included tubular upper and lower control arms, front sway bar, and fully adjustable rear 4-link work together to control body roll and maintain optimal suspension geometry. The result is a Mustang that corners flatter and accelerates smoother.

BUILT FOR POWER AND RELIABILITY

The included QA1 9” fabricated housing delivers exceptional strength and serviceability. Featuring heavy-duty 3” OD ¼” wall axle tubes, 31-spline alloy axles, and formed trailing arm brackets, it’s rated up to 800 HP - giving you peace of mind whether your build is mild or wild.

SPECIFICATIONS

• Performance Level: Level 2
• Includes Shocks: Yes
• Front Spring Rate: 350lb/in.
• Rear Spring Rate: 130lb/in.
• Shock Valving: Double Adjustable
• Axle Shaft Splines: 31
• Width at wheel mount surfaces: 57 3/8 in
• Brake Flange: Big Ford "New Style Torino"
• Brake Offset: 2.5 in
• Bolt Pattern: 5x4.5 in

FEATURES & BENEFITS

• Application-specific fit for 1964–1966 Ford Mustangs
• Complete front and rear suspension solution in one kit
• Single adjustable coilovers with 18 rebound/compression settings
• Tubular upper and lower control arms for better geometry and steering response
• Front sway bar reduces body roll and improves cornering stability
• Rear triangulated 4-link eliminates axle wrap and wheel hop
• Fabricated QA1 9” housing with 31-spline 1541H alloy axles rated up to 650 HP
• Heavy-duty 3” OD ¼” wall axle tubes handle up to 800 HP
• Big Ford “New Style Torino” flanges for brake compatibility
• Adjustable front ride height: stock to –2”
• Adjustable rear ride height: stock to –3”
• 5” bolt pattern fits a wide range of wheels
• Durable black powder coat finish
• Comprehensive instructions for straightforward installation

EASY INSTALLATION

Each component in this system is designed to bolt in or weld in with precision. The front suspension installs using existing mounting points, while the rear 4-link features self-fixturing weld-in brackets for consistent geometry. Once installed, you’ll have a full, modern suspension that fits like it was factory-engineered for today’s performance demands.