UMI Performance 4041-B Rear Lower Control Arms with Roto-Joint Technology

The UMI Performance 4041-B rear lower control arms are engineered for street performance enthusiasts seeking improved handling and traction without sacrificing ride quality. These boxed control arms feature UMI's proprietary Roto-Joint technology combined with Energy Suspension greaseable polyurethane bushings for a bind-free, quiet, and comfortable driving experience.

Construction and Materials:

• Fabricated from heavy-duty 3" x 1-1/2" x 1/8" rectangular steel tubing with 0.120" wall thickness
• CNC machined drawn-over-mandrel bushing holders for precise tolerances and perfect fitment
• MIG and TIG welded construction with welded end caps to prevent road debris intrusion
• Durable powder coat finish for long-lasting corrosion resistance

Roto-Joint Technology:

• Delrin-lined spherical pivot ball provides 28 degrees of total unrestricted movement
• Greaseable design ensures low-friction, bind-free operation
• Eliminates control arm flex and bushing deflection for improved traction and reduced wheel hop
• Absorbs shock and road noise while maintaining precision handling characteristics
• Allows proper suspension articulation for high-performance driving, autocross, and road racing

Hybrid Bushing Configuration:

This control arm set features a strategic hybrid design with Energy Suspension greaseable polyurethane bushings on the chassis end and UMI's Roto-Joint on the axle end. The softer polyurethane bushings absorb road noise and shock before entering the passenger compartment, while the Roto-Joints provide unrestricted rear axle movement for superior performance—making this setup ideal for street-driven performance vehicles.

Additional Features:

• Reinforced sway bar mounting holes with TIG-welded 0.120" wall thickness steel sleeves
• Compatible with OEM and aftermarket rear sway bars
• Uses factory hardware for straightforward installation
• Ships fully assembled and ready to install
• 100% streetable while delivering track-worthy performance

UMI Performance's boxed lower control arms deliver the perfect balance of performance and comfort for street enthusiasts who demand precision handling without compromising daily drivability.