What is the benefit of on-car adjustability?

On-car adjustability means you can make changes to the control arm length and pinion angle without having to remove the arms from your vehicle. This makes the tuning process much quicker and easier, whether you're in your garage or at the track.

What are QA1 rod ends and why are they important?

QA1 rod ends are high-performance spherical bearings that allow for smooth, bind-free movement. The Teflon lining in these specific rod ends prevents metal-to-metal contact, which helps eliminate unwanted noise and ensures quiet operation.

What is pinion angle adjustment and why is it necessary?

Pinion angle is the angle of your rear differential's driveshaft. Adjusting it can improve traction, reduce wheel hop, and enhance acceleration, especially after lowering a vehicle or when preparing for performance driving like track days.

UMI Performance 78-96 GM B-Body Adjustable Upper Control Arms- Ultimate Arms

Specifications

Brand: UMI Performance
Part #: 3617-B
UPC: 3617-B

UMI Performance 78-96 GM B-Body Adjustable Upper Control Arms- Ultimate Arms

Name: UMI Performance 78-96 GM B-Body Adjustable Upper Control Arms- Ultimate Arms
Brand: UMI Performance
Price: 293.75 USD
Availability: InStock

$293.75

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UMI Performance adjustable rear upper control arms. Features 4140 Chrome Moly and QA1 rod ends for improved traction and reduced wheel hop.

Key Features

Fits 1978-1996 Buick LeSabre, Roadmaster, Chevrolet Caprice, Impala, Pontiac Bonneville, and Catalina.
Includes a pair of UMI Performance Ultimate adjustable rear upper control arms.
Constructed from aircraft-quality 4140 Chrome Moly steel for strength and durability.
Features TIG welded construction for maximum durability.
Equipped with high-quality QA1 spherical rod ends with Teflon/Kevlar self-lubricating races for smooth, quiet operation.
Offers on-car adjustability for easy pinion angle tuning using a unique Chrome Moly adjuster.

⚠️ 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

This product includes a pair of UMI Performance Ultimate adjustable rear upper control arms, designed for a range of GM B-Body vehicles from 1977 to 1996. These arms are built to help you tune your suspension for better performance, whether you're hitting the track or just want a more responsive street car. They replace your stock control arms and allow for precise adjustments to your pinion angle, which is key to improving traction and reducing annoying wheel hop.

UMI uses aircraft-quality 4140 Chrome Moly steel for the main body of these control arms, making them strong and durable. The construction is TIG welded for maximum strength. For smooth operation and quiet performance, they're equipped with high-quality QA1 spherical rod ends that have a Teflon lining. This lining prevents metal-on-metal contact, which is a common source of noise in other aftermarket arms. The real advantage here is the on-car adjustability; you can easily lengthen or shorten the arms using the included Chrome Moly adjuster and jam nuts without removing them from the vehicle. This makes dialing in your pinion angle a straightforward process, whether you're at home or at the track.

Adjusting your pinion angle is essential for getting the most out of your rear suspension, especially when you've lowered your vehicle or are looking for improved acceleration. These control arms are a solid option for anyone looking to enhance their car's handling and traction, particularly for performance driving like auto-cross or track days.