UMI Performance 2309-R Lower A-Arm Control Arm Set for GM 4th Gen F-Body

The UMI Performance 2309-R heavy-duty boxed lower A-arm set delivers a rock-solid suspension foundation for autocross, road racing, and aggressive street driving on 4th Gen GM F-Body vehicles. These precision-engineered control arms feature fully gusseted box tubing construction that provides superior rigidity while achieving a 5-pound weight savings per set compared to factory A-arms.

Key Features:

• 100% Made in USA - crafted with pride in Philipsburg, PA
• Premium ball joints pre-installed for convenience
• 0.120-inch wall mild steel box tubing with double gusset design for flex-free operation
• TIG welded 4140 chrome-moly threaded tube adapters for enhanced thread durability
• Race-quality high misalignment rod end on vertical mount
• CNC machined ball joint cups, tubing radiuses, and mounting plates for precision fitment
• Nominal 2-degree caster increase potential for improved handling geometry
• Double shear sway bar mount tabs with end link set included
• Pedestal mount fits DeCarbon, Koni, Bilstein, and aftermarket GM T-bar shocks
• Available in red or black powder coat finish

These A-arms are designed to work with factory K-members, UMI K-members, and virtually all aftermarket K-members. Uses OEM hardware or optional UMI Part #2301 lower A-arm hardware kit (Grade 10.9 bolts, washers, and lock nuts sold separately). The revised ball joint location provides improved caster angle for better straight-line stability and turn-in response.