UMI 64-72 A-Body Tubular Front Upper A-arms, ½” Taller Ball Joints


1964 - 1972 Chevrolet Chevelle, Monte Carlo, Malibu, El Camino
1964 - 1972 Buick Skylark, Grand Sport, Special
1964 - 1972 Pontiac Lemans, GTO, Tempest
1964 - 1972 Oldsmobile Cutlass, 442, F-85

Improve handling and make your classic A-Body feel like a modern day muscle car by combining our popular P/N 4033 upper a-arms with ½" taller premium ball joints. P/N 4033-1 a-arms combine the benefit of additional caster with increased negative camber potential throughout the suspension travel. The relocated ball joint plate offers up to six degrees caster without excessive shimming while the ½" taller ball joint creates up to one additional degree negative camber at full bump travel. Expect improved steering feel courtesy of increased caster and an overall increase in lateral grip due to the camber improvement. Features include greaseable, low deflection UMI designed and manufactured Delrin bushings, chromoly cross shafts, improved header clearance and polyurethane bump stops. These track-tested, jig built DOM A-arms are supplied with a durable gloss red or black powder coat finish which guarantees your performance parts stay beautiful on your street car, drag car, autocrosser or Pro-touring machine. Designed and manufactured with pride in Philipsburg, PA - USA.

Hardware kit, Part # 4003 - Upper A-Arm hardware kit includes 7/16-14 Grade 8 bolts, washers and nylock nuts. Kit includes everything needed to mount your new UMI Performance A-Arms to your vehicle.

  • New premium 1/2" taller ball joints for improved camber curve
  • Relocated ball joint pad for increased caster without excess shims
  • CNC machined ball joint mount & tubing radiuses
  • Robust tubular design with machined gussets
  • Precision bent tubing on programmable tube bender
  • TIG welded for superior strength and clean looks
  • 4140 chromoly cross shafts, CNC machined & zinc plated
  • UMI built, greaseable & fluted CNC machined no deflection Delrin bushings
  • Polyurethane bump stops included
  • Direct bolt-in compatible with factory or UMI lower a-arm and factory spindle
  • May also work in conjunction with other brand lower A-arms and/or spindles
  • Package includes recommended alignment specs and detailed installation instructions

Note: The UMI 4033 upper a-arm is designed to work with factory height or lowered cars. We do not recommend using the 4033 with cargo coils or above stock height cars, as the bump stop may contact the cross brace.