What is the benefit of the relocated ball joint plate?

The relocated ball joint plate allows for up to six degrees of caster to be added to your suspension setup. This increased caster significantly improves steering feedback, making the car feel more stable and precise, especially at higher speeds.

What are Delrin bushings and why are they used here?

Delrin is a strong, low-friction plastic material that UMI uses for its bushings. These bushings offer minimal deflection compared to rubber, which translates to a tighter, more responsive suspension feel and improved steering accuracy.

Does this kit include everything needed for installation?

Yes, the package includes the tubular upper A-arms with installed ball joints and Delrin bushings, polyurethane bump stops, and a hardware kit. This kit contains Grade 8 bolts, washers, and nylock nuts needed to mount the A-arms to your vehicle, along with installation instructions.

UMI Performance 64-72 GM A-Body Tubular Front Upper A-Arms Delrin Bushings

Specifications

Brand: UMI Performance
Part #: 4033-B
UPC: 4033-B

UMI Performance 64-72 GM A-Body Tubular Front Upper A-Arms Delrin Bushings

Name: UMI Performance 64-72 GM A-Body Tubular Front Upper A-Arms Delrin Bushings
Brand: UMI Performance
Price: 685.43 USD
Availability: InStock

$685.43

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UMI Performance tubular upper A-arms with Delrin bushings for 1964-1972 GM A-Body. Improves handling and steering feedback.

Key Features

Fits 1964-1972 GM A-Body vehicles including Chevrolet Chevelle, Buick Skylark, and Pontiac GTO.
Relocated ball joint plate allows for up to six degrees of caster without excessive shimming.
UMI-built, greaseable, and fluted CNC machined Delrin bushings offer minimal deflection for improved steering feel.
Includes 4140 CrMo cross shafts that are CNC machined and zinc plated for durability.
Robust tubular design is bent on a programmable tube bender and TIG welded for superior strength.
Comes with polyurethane bump stops and premium ball joints already installed.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

UMI Performance is known for building well-made suspension components that help classic cars handle like modern machines. If you're looking to give your classic GM A-Body a significant boost in steering feel and overall handling, these tubular front upper A-arms are a solid choice. They're designed to bolt right onto a wide range of vehicles, including the Chevrolet Chevelle, Buick Skylark, and Pontiac GTO, making a big difference in how your car feels on the road or at the track.

What sets these A-arms apart is the relocated ball joint plate, which allows for up to six degrees of caster without needing a stack of shims. This increased caster is key to improving steering feedback, giving you a more precise and connected feel to the road. UMI builds these arms with their own greaseable Delrin bushings, which are known for offering minimal deflection for a tight, responsive suspension. They also feature CrMo cross shafts for strength, improved header clearance, and polyurethane bump stops. The robust tubular design is bent on a programmable bender and TIG welded for superior strength, then finished with a durable gloss red or black powder coat to keep them looking good.

This package includes everything you need for installation, including the necessary hardware kit with Grade 8 bolts and nuts, plus detailed installation instructions with recommended alignment specs. They are designed to work with factory height or lowered cars, and are compatible with factory or UMI lower A-arms and factory spindles. For even more performance tuning, consider the P/N 4033-1, which offers a taller ball joint for an improved camber curve.