UMI Performance 3041-B Boxed Lower Control Arms with Roto-Joints

UMI Performance's boxed lower control arms combine superior construction with innovative Roto-Joint technology to deliver bind-free performance and a comfortable ride quality. Designed for street performance enthusiasts, these control arms eliminate flex and bushing deflection for improved traction and reduced wheel hop.

Advanced Roto-Joint Technology:

Each control arm features UMI's proprietary Roto-Joint on the rear axle end, utilizing a delrin-lined pivot ball that provides 28 degrees of unrestricted movement. This low-friction design allows proper suspension articulation for precision handling while absorbing shock and road noise. The greaseable delrin race ensures quiet, smooth operation on both street and track-driven vehicles.

Hybrid Bushing Design:

The chassis mounting end utilizes Energy Suspension greaseable polyurethane bushings, which are softer to absorb additional road noise and shock before it enters the passenger compartment. This hybrid setup—polyurethane at the chassis, Roto-Joint at the axle—provides the perfect balance of performance and streetability.

Premium Construction Features:

• Fabricated from 3" x 1-1/2" x 1/8" (0.120" wall thickness) rectangular steel tubing
• CNC machined drawn-over-mandrel bushing holders for accurate tolerances and perfect fit
• MIG and TIG welded construction for superior strength and durability
• MIG welded end caps prevent road debris intrusion
• Reinforced sway bar mounting holes with 0.120" wall thickness steel sleeves, TIG welded and sanded flush
• Durable powder coat finish for long-lasting appearance
• Uses OEM hardware for direct installation

Ready to Install:

Ships fully assembled with Roto-Joints and polyurethane bushings installed. Includes correct provisions for stock or aftermarket rear sway bars. Ideal for street performance applications, autocross, road racing, and enthusiast builds requiring improved handling without sacrificing ride quality.