78-88 GM G-Body Upper & Lower Front A-Arm Kit, Standard Upper Ball Joints


1978 - 1988 Chevrolet Monte Carlo, Malibu, El Camino
1978 - 1988 Buick Regal, Grand National
1978 - 1988 Pontiac Grand Prix, LeMans
1978 - 1988 Oldsmobile Cutlass

Improve handling and fulfill your G-body's built-in performance potential by installing our P/N 303133-1 tubular upper and lower a-arms. UMI’s P/N 303133-1 upper and lower a-arm kit replaces the worn out, stock stamped a-arms with high-strength tubular construction and a host of premium features. The stock geometry lower a-arms feature tough tubular construction with greaseable polyurethane bushings for precise handling and smooth suspension motion. The ball joint mount is angled slightly from stock to permit usage with lowered vehicles and the design offers additional wheel clearance. The tubular upper a-arms are assembled with smooth operating, low deflection UMI designed and manufactured Delrin bushings as well as UMI-built billet chromoly cross shafts. They feature a relocated mounting pad to increase caster without excessive shims. Both upper and lower a-arms are jig built to maintain accuracy for a perfect fit every time and come preloaded with premium ball joints. Critical areas are TIG welded for superior strength and a clean look. UMI’s extensive testing on the street, drag strip and skid pad ensures a quality product able to with stand all types of conditions. The ultra tough red or black powder coat finish guarantees your performance parts stay beautiful on your street car, drag car, autocrosser or Pro-Touring machine. The P/N 303133-1 a-arm kit will work with factory springs, lowering springs and coil over kits such as the popular QA1 coil over set up. For the best handling and tire life from the UMI designed a-arms, included with each kit are recommended alignment specs along with detailed installation instructions. UMI Performance a-arm kit P/N 303133 is shipped fully assembled and ready for installation. For even more performance, check out kit #303133-2 which adds the benefit of a ½” taller ball joint in the upper a-arms for an improved camber curve and flatter contact patch.


  • Kit affords an 8lb weight savings over factory a-arm set
  • Relocated upper ball joint mounting pad for improved caster &  better steering feel
  • Upper a-arms assembled with UMI manufactured greaseable & fluted CNC machined zero deflection Delrin bushings
  • 4140 chromoly cross shafts, CNC machined & zinc plated
  • CNC machined ball joint holders and tubing radiuses
  • TIG welded DOM tubing for superior strength and clean looks
  • Greaseable & fluted polyurethane bushings in lower a-arms for precision handling and a smooth ride
  • Polyurethane bump stops and new premium ball joints installed
  • Durable glossy red or black powder coat finish
  • Fits factory spindle, drop spindles and works with factory springs, lowering springs and coilover kits
  • Package includes recommended alignment specs and detailed installation instructions
  • Simply bolt-on and go
  • Designed and manufactured with pride in Philipsburg, PA – USA