What is the main benefit of a fully boxed control arm?

A fully boxed control arm, like this UMI Performance part, is stronger and more rigid than a standard C-channel arm. The boxing and capped ends help minimize suspension deflection, which leads to crisper handling and reduced wheel hop.

Do these control arms come with new bushings?

Yes, these control arms are assembled with greaseable polyurethane bushings and zinc-plated sleeves. This setup helps ensure a quiet and comfortable ride while allowing for easy lubrication.

Can I still mount my factory sway bar with these control arms?

Yes, these control arms feature reinforced sway bar mounting holes with TIG welded sleeves. They are designed to accept factory-style sway bars, including UMI's popular 1-inch version.

UMI Performance 64-72 GM A-Body Rear Lower Control Arms Fully Boxed Premium

Specifications

Brand: UMI Performance
Part #: 4021-R
UPC: 4021-R

UMI Performance 64-72 GM A-Body Rear Lower Control Arms Fully Boxed Premium

Name: UMI Performance 64-72 GM A-Body Rear Lower Control Arms Fully Boxed Premium
Brand: UMI Performance
Price: 402.55 USD
Availability: InStock

$402.55

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UMI Performance 64-72 GM A-Body Rear Lower Control Arms Fully Boxed Premium. Minimizes suspension deflection for crisper handling and reduced wheel hop.

Key Features

Fits 1964-1972 GM A-Body vehicles including Chevrolet Chevelle, Buick Skylark, and Pontiac GTO.
Fully boxed design with capped ends maintains a factory look and prevents debris entry.
Constructed from strong 3” x 1-1/2” x 1/8” wall mild steel rectangular tubing.
Assembled with greaseable polyurethane bushings and zinc plated sleeves for a comfortable ride and easy maintenance.
Features CNC machined radius ends and heavy-duty MIG welded bushing holders for accuracy and strength.
Includes reinforced sway bar mounting holes with TIG welded sleeves for factory-style sway bar compatibility.

⚠️ 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 making well-built suspension components for classic American cars. These fully boxed rear lower control arms are designed for your 1964-1972 GM A-Body vehicle, like a Chevrolet Chevelle, Buick Skylark, or Pontiac GTO. They offer an improved look and feel for your rear suspension, helping to reduce unwanted movement for better performance on the street, strip, or track.

These control arms are constructed from strong 3” x 1-1/2” mild steel rectangular tubing and are fully boxed with capped ends. This design not only looks like the factory part but also keeps debris out. They feature CNC machined radius ends and bushing holders for accuracy, with MIG welded heavy-duty bushing holders for added strength. The arms come assembled with greaseable polyurethane bushings and zinc-plated sleeves, which help provide a quiet and comfortable ride while allowing for easy maintenance. Reinforced sway bar mounting holes with TIG welded sleeves are included, ready to accept factory-style sway bars, including UMI's own 1-inch version.

With a durable black powder coat finish, these control arms are built to last and maintain their appearance. Installation is straightforward, typically taking about an hour with basic hand tools, making them a solid option for improving your classic GM's handling.