UMI Performance 3042-R Boxed Lower Control Arms with Roto-Joint Technology

The UMI Performance 3042-R boxed lower control arms are engineered for drivers who demand improved traction, reduced wheel hop, and precise handling on both street and track. Built from 3" x 1-1/2" x 1/8" rectangular steel tubing with 0.120" wall thickness, these arms feature CNC machined drawn-over-mandrel bushing holders and MIG welded end caps that seal out road debris for long-term durability.

Roto-Joint Technology:

At the heart of these control arms is UMI's proprietary Roto-Joint — a spherical pivot ball lined with a greaseable Delrin race. This design provides 28 degrees of total unrestricted movement, completely eliminating the bushing deflection and control arm flex associated with factory rubber or aftermarket polyurethane bushings. The Delrin liner absorbs shock and road noise for a quiet, smooth ride on any street or track application. Roto-Joints are installed on both ends of each arm for maximum suspension travel and bind-free performance.

Key Features:

• Fabricated from 3" x 1-1/2" x 1/8" rectangular steel tubing with 0.120" wall thickness
• CNC machined components for accurate tolerances and a perfect fit
• MIG and TIG welded construction for superior strength and rigidity
• Spherical Roto-Joints installed on both ends for bind-free, low-friction performance
• Greaseable Delrin-lined Roto-Joints with 28 degrees of total unrestricted movement
• Reinforced sway bar holes with 0.120" wall thickness steel sleeve, TIG welded and sanded flush
• Compatible with stock and aftermarket rear sway bars
• Durable powder coat finish for long-lasting protection
• Uses OEM hardware — no additional hardware required
• Shipped fully assembled and ready to install

By eliminating control arm flex and bushing deflection, the 3042-R delivers improved traction and significantly reduced wheel hop — making it an ideal upgrade for autocross, road racing, and spirited street driving alike. The Roto-Joint's low-maintenance design and 100% street-legal setup make these arms a versatile solution for any performance build.