UMI Performance 1057-B Tubular Lower Control Arms Ford Mustang Roto-Joint

The UMI Performance 1057-B tubular lower control arms are engineered for 2005 and newer Ford Mustang applications, delivering a bind-free performance suspension upgrade without sacrificing street comfort. These arms feature UMI's proprietary Roto-Joint technology on one end and Energy Suspension greaseable polyurethane bushings on the other — a hybrid setup purpose-built for street performance enthusiasts.

Each arm is constructed from 1.250" x 0.120" DOM mild steel tubing, fully TIG welded for superior strength and finished in a durable, brilliant powder coat. The set ships fully assembled and ready to install using OEM hardware.

UMI Roto-Joint Technology:

• Provides 28 degrees of total unrestricted movement, virtually eliminating suspension bind and wheel hop
• Features a 4140 chromoly, hard chrome-plated spherical ball rotating in a CNC-machined Delrin race for long-lasting wear resistance
• Delrin bushing material offers high tensile strength, excellent wear resistance, and stable physical properties under demanding conditions
• Greaseable and 100% rebuildable — the adjuster ring can be tightened as the Delrin race wears, or the race can be fully replaced
• The installed Delrin race absorbs shock and road noise for smooth, quiet operation on street or track

Polyurethane Bushing End:

• Energy Suspension greaseable polyurethane bushings installed on the chassis-side mount
• Softer bushing compliance reduces road noise and harshness transmitted into the passenger compartment
• Low maintenance design with grease fittings for extended service life

Key Features:

• Constructed from 1.250" x 0.120" DOM mild steel tubing
• Fully TIG welded construction for maximum strength and durability
• Durable powder coat finish resists chipping and corrosion
• Uses OEM hardware for straightforward installation
• Shipped fully assembled and ready to install
• Roto-Joint attaches to the rear-end side; polyurethane bushing mounts to the chassis side
• Compatible with street performance, autocross, and road race applications

Included Spanner Wrench: A spanner wrench is included for adjusting and disassembling the Roto-Joint. It is used to tighten the adjuster ring as the Delrin race wears, and to disassemble the joint for cleaning, inspection, and rebuilding.

The UMI Performance 1057-B lower control arms deliver precision handling and traction improvements over factory rubber or standard polyurethane bushings, while remaining a 100% street-friendly setup. The Roto-Joint's ability to articulate freely eliminates the deflection associated with softer bushings, resulting in improved traction and a significant reduction in wheel hop — making these arms an ideal upgrade for any performance-oriented Mustang build.