UMI Performance 4021-B Rear Lower Control Arms - Boxed Design with Polyurethane Bushings

UMI Performance's 4021-B boxed rear lower control arms deliver enhanced suspension performance while maintaining a factory appearance. Built from heavy-duty 3" x 1-1/2" x 1/8" wall rectangular mild steel tubing, these fully boxed arms provide superior strength and rigidity compared to stock stamped steel components.

Key Features:

• Fully boxed design with capped radius ends prevents debris entry while maintaining OEM aesthetics
• CNC machined radius ends and bushing holders ensure precision fit and consistency
• Greaseable polyurethane bushings with zinc-plated sleeves for quiet, comfortable ride quality
• MIG welded heavy-duty bushing holders for maximum durability
• TIG welded reinforced sway bar mounting holes accept factory and aftermarket sway bars up to 1" diameter
• Durable black powder coat finish resists corrosion and wear
• Made in Philipsburg, Pennsylvania, USA

These boxed lower control arms minimize suspension deflection for crisp handling and reduced wheel hop, making them ideal for street driving, drag racing, or road course applications. Installation takes approximately one hour using basic hand tools. The fully boxed construction offers the strength needed for performance applications while the finished end caps provide a clean, factory-style appearance for classic muscle car restorations.