UMI Performance 4056-1-R Front Upper Control Arms A-Body GM

The UMI Performance 4056-1-R front upper control arms are precision-engineered for A-Body GM vehicles, designed to deliver exceptional performance in Pro-Touring, road racing, autocross, and aggressive street driving applications. These race-quality arms feature a relocated ball joint pad that increases caster and improves steering feel and stability without the need for excessive shims.

Key Features:

• Constructed from 0.120" wall thickness, 1.250" diameter DOM tubing for maximum strength-to-weight ratio
• Precision TIG welded for superior strength and clean appearance
• 4130 chromoly cross shafts, CNC machined and zinc plated for durability
• Laser cut ball joint mounting pad ensures precise fitment
• Shortened cross shaft to ball joint distance optimizes suspension geometry
• Travel limiting bolt compatible for suspension tuning
• Polyurethane bump stops included
• Direct bolt-in compatibility with factory or UMI lower A-arms and tall spindles

Important Compatibility Notes:

• Includes standard height ball joints and must be used with A-Body tall spindles
• In most cases, shims are not required for proper alignment
• Package includes recommended alignment specifications and detailed installation instructions
• Hardware kit (Part #4003) sold separately - includes Grade 8 bolts, washers, and nylock nuts

Designed, tested, manufactured, and raced in Philipsburg, Pennsylvania USA. UMI Performance's adjustable upper A-arms deliver shim-free camber and caster adjustment with race-quality rod ends that provide smooth suspension travel and precise geometry control for maximum performance.