QA1 HK42-GMF2RS Level 2 Handling Kit with OE Width 9in. Housing 1970-74 GM F-Body

The QA1 HK42-GMF2RS is a complete Level 2 full-vehicle suspension handling kit designed for 1970–74 GM F-Body vehicles. Purpose-built for enthusiasts seeking upgraded street and track performance, this kit replaces the entire front and rear suspension system with a high-performance adjustable coilover and tubular 4-link setup, paired with a custom QA1 OE-width 9-inch rear housing.

Bind-Free, Lightweight Front Suspension:

• Lightweight tubular front control arms among the lightest available in the market
• Low-friction ball joints and polyurethane bushings minimize flex and deliver bind-free movement
• Double adjustable Pro-Coil coilovers paired with a front sway bar for precise suspension control
• Provides 0 to -2 inches of front ride height adjustability

Performance 4-Link Rear Suspension:

• Adjustable tubular 4-link design eliminates wheel hop and improves traction
• Rear sway bar and subframe connectors tie the chassis together for flat, planted cornering
• Up to +2 to -3 inches of rear ride height adjustability for the ideal stance
• Designed to accommodate wider wheels and tires, including clearance for up to 12-inch-wide wheels and 335 tires with mini tubs

OE Width 9-Inch Rear Housing:

• Fabricated center section with 3-inch OD wall axle tubes rated to support 800 HP
• 31-spline axles rated to 650 HP
• Factory OE wheel mounting surface width with Big Ford New Style Torino axle flanges
• 5x4-3/4 bolt pattern for broad wheel compatibility
• Powder coat finish with drain and fill plugs, jack pad, and all necessary hardware included
• Requires third member for Ford 9-inch housing with 31-spline axles

Installation Notes:

• Bolt-in front suspension — no cutting or fabrication required
• Rear crossmember requires minimal MIG welding
• Spanner wrench included
• QA1 subframe connectors strongly recommended
• May require exhaust modification
• Wheel and tire fitment should be verified on the vehicle

Warranty: QA1 shocks are backed by a best-in-class lifetime warranty when registered at QA1.net/warranty. All other components carry a one-year limited warranty against defects in materials and workmanship.

Proudly manufactured in Lakeville, Minnesota, the QA1 HK42-GMF2RS delivers the performance, tunability, and durability that GM F-Body enthusiasts demand for both street driving and track day events.