UMI Performance 4040-R Rear Lower Control Arms with Roto-Joint Technology

UMI Performance's 4040-R rear lower control arms deliver bind-free suspension performance and superior handling for street and track applications. These tubular control arms feature UMI's innovative Roto-Joint technology, which provides 28 degrees of unrestricted movement for optimal suspension articulation while maintaining a quiet, comfortable ride quality.

Key Features:

• Roto-Joints installed on both sides for maximum performance and suspension travel
• Greaseable Delrin race absorbs shock and road noise while offering low deflection for improved traction
• Constructed from 1.500" x 0.120" wall DOM mild steel tubing for exceptional strength
• Fully TIG welded construction with reinforced sway bar mounting holes
• Reinforced sway bar holes feature 0.120" wall thickness steel sleeves, TIG welded and sanded flush
• Durable powder coat finish provides brilliant appearance and corrosion protection
• Uses OEM hardware for straightforward installation
• Shipped fully assembled and ready to install

The Roto-Joint design significantly outperforms factory rubber and aftermarket polyurethane bushings by eliminating bind and allowing the suspension to work as designed. This precision-engineered pivot ball system enables the rear end to move freely during high-performance driving, autocross, or road racing while remaining 100% streetable. The greaseable design ensures low maintenance and long service life, making these control arms an excellent choice for daily drivers, weekend cruisers, and dedicated race cars alike.