Product details

UMI’s adjustable upper a-arms are designed to excel in Pro-Touring, road race, auto-x and hot street corner carving. The race quality rod ends provide shim-free camber and caster adjustment along with ultimate smooth travel. This arm features a relocated ball joint pad to increase caster and improve stability and steering feel as well as a shortened cross shaft to ball joint distance. We recommend the 4056 arm for all racing applications. Arm must be used with tall spindles when using standard height ball joints. 100% manufactured, tested and raced out of Philipsburg, PA – USA. 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 needed. Shims may still be required on some applications. Hardware kit, Part # 4003 - Upper a-arm hardware kit includes Grade 8 bolts, washers and nylock nuts. Kit includes everything needed to mount your new UMI Performance A-Arms to your vehicle Relocated ball joint pad for increased caster and improved steering feel without excess shims. May also work in conjunction with other lower a-arms and/or spindles (contact UMI to discuss). Package includes recommended alignment specs and detailed installation instructions. Direct bolt-in compatible with factory or UMI lower a-arm and tall spindles. Designed, tested, manufactured and raced in Philipsburg, PA-USA. 4056-1 - 1964-1972 GM A-Body Front Upper A-arms, Adjustable 0.120” wall thickness 1.250” diameter DOM tubing. 4130 CrMo cross shafts, CNC machined & zinc plated. TIG welded for superior strength and clean looks. Laser cut ball joint mounting pad. Polyurethane bump stops included. Travel limiting bolt compatible. Features and benefits:

Manufacturer fitment & guides

Check 4056-1-B against the manufacturer’s application information below.

A manufacturer application guide is not available for this listing. Request the exact application from JuiceBuilt before payment.

Part-specific notes

• California Proposition 65: Y