UMI Performance Suspension Control Arm

UMI Performance Suspension Control Arms: Precision Engineering for Muscle Car Handling

When stock control arms stand between your muscle car and its true handling potential, UMI Performance delivers the solution. As one of the most respected names in American muscle car suspension, UMI has built its reputation on suspension control arms that are engineered to eliminate the flex, bushing deflection, and geometric slop that plague factory setups — whether your goal is pro-touring, autocross, drag racing, or spirited street driving.

What Sets UMI Control Arms Apart

UMI Performance's control arms are the product of genuine hands-on development. The company installs and tests every chassis and suspension component it makes to ensure real-world performance before it ever reaches a customer's car. Every arm is manufactured in-house at UMI's facility in Philipsburg, Pennsylvania, where the production process includes CNC machining, CNC laser cutting, MIG and TIG welding, and a durable powdercoat finish — all under one roof, with zero outsourcing.

The lineup covers a wide range of configurations designed to match your build goals:

• Adjustable Upper Control Arms (“Ultimate Arms”): UMI's signature adjustable uppers feature a unique chromoly on-car adjuster that allows pinion angle changes right in the driveway — simply loosen two nuts and turn the adjuster with the arms still on the car. These arms use 4140 chromoly threaded tube adapters and a heat-treated 1.000 in. solid adjuster for maximum durability. PTFE-lined spherical rod ends provide “bind-free” operation ideal for track and autocross use.
• Boxed Lower Control Arms: UMI's boxed lowers are built from 0.120" wall thickness rectangular tubing with CNC-machined drawn-over-mandrel bushing holders and MIG-welded end caps to seal out road debris. They are a direct bolt-on replacement designed to minimize wheel hop, improve cornering, and increase track consistency.
• Poly/Roto-Joint Combinations: For street-performance builds, UMI offers control arms pairing polyurethane bushings on the chassis side with their proprietary swivel Roto-Joint on the axle end. The Roto-Joint's Delrin race liner absorbs shock and road noise for a smooth, quiet ride without sacrificing performance feedback.
• Energy Suspension Polyurethane Bushings: Many UMI control arms are equipped with greaseable Energy Suspension polyurethane bushings and zinc-plated steel sleeves as a major step up from the deflection-prone OEM rubber units.

Broad Vehicle Coverage

UMI's control arm catalog spans the most beloved American performance platforms, including GM A-Body, F-Body (1970–2002), B-Body, G-Body, and Ford Mustang applications. Coverage includes classic G-Body platforms like the 1978–1988 Monte Carlo, Regal/Grand National, Cutlass, and Grand Prix, making UMI a go-to resource for builders working across multiple generations of American iron.

Whether you are building a dedicated autocross weapon, a drag-strip-focused machine looking to cut 60-foot times, or a street pro-touring cruiser that needs crisp handling without harshness, UMI Performance's control arm lineup offers a fitment and bushing configuration tuned for your exact use case. Explore the full UMI Performance brand page or browse all available suspension control arms to find the right upgrade for your build.