UMI Performance 4056-1-B Adjustable Upper A-Arm Front Control Arm

The UMI Performance 4056-1-B is a high-performance adjustable upper A-arm engineered for Pro-Touring, road racing, autocross, and high-performance street driving. Designed to deliver shim-free camber and caster adjustment with race-quality rod ends, this arm provides precise geometry tuning and superior steering feel over stock components.

The relocated ball joint pad increases caster and improves stability and steering feel, while the shortened cross shaft-to-ball joint distance optimizes front suspension geometry. This arm is a direct bolt-in replacement compatible with factory lower A-arms, UMI lower A-arms, and tall spindles.

Key Features:

• Constructed from 0.120" wall thickness, 1.250" diameter DOM tubing for maximum strength and durability
• 4130 CrMo cross shafts — CNC machined and zinc plated for corrosion resistance
• Laser cut ball joint mounting pad for precise fitment and alignment
• Relocated ball joint pad increases caster and improves steering feel without excess shims
• Race-quality rod ends provide shim-free camber and caster adjustment
• TIG welded for superior strength and clean appearance
• Travel limiting bolt compatible
• Polyurethane bump stops included
• Direct bolt-in compatible with factory or UMI lower A-arms and tall spindles
• Designed, tested, manufactured, and raced in Philipsburg, PA — USA

What's Included:

• UMI Performance 4056-1-B adjustable upper A-arm
• Polyurethane bump stops
• Recommended alignment specifications
• Detailed installation instructions

Hardware Kit (Sold Separately): Part #4003 upper A-arm hardware kit includes Grade 8 bolts, washers, and nylock nuts — everything needed to mount your new UMI Performance A-arms.

Note: Upper A-arm P/N 4056-1 includes standard height ball joints and must be used with A-Body tall spindles. In most cases, shims are not required, though some applications may still need them. May also work in conjunction with other lower A-arms and/or spindles — contact UMI Performance to confirm compatibility.