How do I adjust the pinion angle with these control arms?

Adjustment is done on the vehicle. You'll need to loosen the two jam nuts on the adjuster, then turn the solid adjuster to lengthen or shorten the control arm. This changes the pinion angle of your rear end.

What materials are used in the construction of these control arms?

These 'Ultimate Arms' are built with aircraft-quality 4140 chromoly steel for the threaded tube adapters and the solid adjuster. They also feature Teflon-lined spherical rod ends and CNC-machined 6061 aluminum step bushings.

What is the benefit of adjustable upper control arms?

Adjustable upper control arms allow you to precisely set your vehicle's pinion angle. This is particularly important when lowering a car, as it helps to correct the angle of the driveshaft and rear differential, which can improve traction and reduce unwanted vibrations or wheel hop.

UMI Performance 68-72 GM A-Body Adjustable Upper Control Arms - Ultimate Arms

Specifications

Brand: UMI Performance
Part #: 4017-R
UPC: 4017-R

UMI Performance 68-72 GM A-Body Adjustable Upper Control Arms - Ultimate Arms

Name: UMI Performance 68-72 GM A-Body Adjustable Upper Control Arms - Ultimate Arms
Brand: UMI Performance
Price: 271.99 USD
Availability: InStock

$271.99

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UMI Performance adjustable upper control arms for 1968-1972 GM A-Body vehicles. Tune your suspension for improved traction.

Key Features

Fits 1968-1972 GM A-Body vehicles including Buick Skylark, Chevrolet Chevelle, and Pontiac GTO.
Allows for on-car adjustment of the rear pinion angle to improve traction and reduce wheel hop.
Constructed with aircraft-quality 4140 chromoly steel for strength and durability.
Features a 1.000-inch solid, heat-treated 4140 chromoly adjuster for precise length changes.
Teflon-lined spherical rod ends provide bind-free operation for better suspension movement.
Includes CNC-machined 6061 aluminum step bushings and a durable powder coat finish.

⚠️ 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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Product Details

UMI Performance is well-known for making solid suspension components, and these Ultimate Arms are a prime example of that. If you're working on a 1968-1972 GM A-Body car like a Chevelle, Skylark, or GTO, these adjustable upper control arms are designed to help you dial in your rear suspension. They allow for on-car adjustments to the pinion angle, which is crucial for getting the most out of your setup, especially if you've lowered your vehicle. Properly setting the pinion angle can help reduce wheel hop and improve traction, leading to better performance off the line.

These arms are built tough. UMI uses aircraft-quality 4140 chromoly steel for the threaded tube adapters and the solid adjuster, which is a step up from the mild steel found in some other parts. The adjuster itself is a 1-inch solid chromoly piece, and the whole assembly is TIG welded for strength. For smooth, bind-free operation, they feature Teflon-lined spherical rod ends and CNC-machined aluminum step bushings. The durable powder coat finish helps protect them from the elements, and the whole setup is designed for easy adjustment right on the car by simply loosening two jam nuts and turning the adjuster.