UMI Performance 3627-B Boxed Rear Lower Control Arms with Dual Roto-Joints Black

Built as a direct bolt-in replacement for factory stamped steel arms, these control arms are constructed from 3" x 1-1/2" x 0.120" wall thickness rectangular steel tubing for exceptional rigidity and resistance to flex under hard acceleration and cornering. CNC machined drawn-over-mandrel bushing holders and MIG-welded end caps keep road debris out of the arm cavity while ensuring precise tolerances and a clean, factory-style appearance.

Dual Roto-Joint Technology:

• Roto-Joints on both ends of each control arm replace factory rubber and aftermarket polyurethane bushings for maximum bind-free articulation
• Each Roto-Joint is a spherical pivot ball lined with a greaseable Delrin race, offering 28 degrees of total unrestricted movement for low-friction, bind-free operation
• The Delrin-lined race absorbs shock and road noise for a smooth, quiet ride on street or track
• Eliminates control arm flex and bushing deflection for improved traction and reduced wheel hop
• Roto-Joints are greaseable and low-maintenance — suitable for daily street driving, autocross, or road racing

Construction & Finish:

• Fabricated from 3" x 1-1/2" x 1/8" rectangular steel tubing for maximum structural integrity
• MIG and TIG welded construction throughout for superior strength
• Reinforced sway bar holes with a 0.120" wall thickness steel sleeve, TIG welded and sanded flush — accepts stock or aftermarket rear sway bars
• Durable black powder coat finish for long-lasting corrosion resistance
• Ships fully assembled and ready to install using OEM hardware

Designed for enthusiasts who demand the best of both worlds — precision performance and streetable comfort — the 3627-B control arms are ideal for high-performance street cars, autocross builds, and road race applications. The solid boxed construction combined with dual Roto-Joints eliminates the bushing deflection and weak stamped materials that compromise traction and handling consistency in factory arms.