UMI Performance · New
UMI Performance 64-72 A-Body Tubular Front Upper A-arms 1/2in Taller Ball Joints
MPN 4033-1-R · Store SKU umi4033-1-R
Supplier stock checked 11/7/2026, 5:45:40 AM UTC. Adding a part does not reserve it.
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Product details
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, CrMo 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. 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. 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. Package includes recommended alignment specs and detailed installation instructions Direct bolt-in compatible with factory or UMI lower a-arm and factory spindle 4033-1 - 1964-1972 A-Body Tubular Front Upper A-arms, ½” Taller Ball Joints May also work in conjunction with other brand lower A-arms and/or spindles UMI built, greaseable & fluted CNC machined no deflection Delrin bushings Relocated ball joint pad for increased caster without excess shims New premium 1/2" taller ball joints for improved camber curve 4140 CrMo cross shafts, CNC machined & zinc plated Precision bent tubing on programmable tube bender TIG welded for superior strength and clean looks CNC machined ball joint mount & tubing radiuses Robust tubular design with machined gussets Polyurethane bump stops included Features:
Manufacturer fitment & guides
Check 4033-1-R against the manufacturer’s application information below.
Part-specific notes
- California Proposition 65: Y
