Why are these control arms necessary for a 12-bolt swap?

When swapping a GM A-Body rear end into a G-Body chassis, factory control arms will cause significant rear end bind and incorrect driveline angles. These UMI Performance arms are built with the correct geometry and adjustability to prevent these issues, ensuring proper handling and reducing vibrations.

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

The control arms feature on-car adjustability using a right and left-hand thread adjuster made from heat-treated 4140 Chrome Moly. This allows you to precisely set the correct pinion angle for your driveline.

What is the benefit of the QA1 spherical bearing rod end?

The QA1 rod end allows the rear end to move more freely, which is beneficial for performance driving like auto-cross or road racing. It also helps eliminate rear end bind, improving performance for drag racing applications.

UMI Performance 78-88 GM G-Body 12-Bolt Swap Adjustable Upper Control Arms

Specifications

Brand: UMI Performance
Part #: 3019-B
UPC: 3019-B

UMI Performance 78-88 GM G-Body 12-Bolt Swap Adjustable Upper Control Arms

Name: UMI Performance 78-88 GM G-Body 12-Bolt Swap Adjustable Upper Control Arms
Brand: UMI Performance
Price: 326.39 USD
Availability: InStock

$326.39

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UMI Performance adjustable upper control arms for 78-88 GM G-Body 12-bolt swaps. Eliminates rear end bind and sets pinion angle.

Key Features

Fits 1978-1988 Buick Regal, Chevrolet Malibu, Chevrolet Monte Carlo, Oldsmobile Cutlass, Pontiac Grand Prix, and Pontiac LeMans.
Designed to bolt a 1964-1972 GM A-Body 10-bolt or 12-bolt rear end into a 1978-1988 GM G-Body.
TIG welded construction ensures a strong and durable assembly.
Features 4140 Chrome Moly tube adaptors for thread durability.
Includes CNC machined 6061 aluminum step bushings.
Adjustable on the vehicle using a 4140 Chrome Moly adjuster for precise pinion angle setting.

⚠️ 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

If you're swapping a 1964-1972 GM A-Body 10-bolt or 12-bolt rear end into your 1978-1988 GM G-Body, these adjustable upper control arms from UMI Performance are a crucial part of the job. Vehicles like the Monte Carlo, Malibu, Regal, Grand National, and Cutlass can all benefit from this swap, but using factory control arms will lead to significant rear end bind and an incorrect driveline angle. This can cause issues like lost traction, vibrations, and unstable handling.

These control arms are built with the correct geometry to properly connect your G-Body chassis to the A-Body rear end. They feature TIG welded construction for strength and include 4140 Chrome Moly tube adaptors for durability. The arms are adjustable on the car, allowing you to set the correct pinion angle and make installation easier. Adjustments are made with a heat-treated 4140 Chrome Moly adjuster and a QA1 spherical bearing rod end, which allows the rear end to move freely. This is beneficial for performance driving like auto-cross or road racing, and it also helps eliminate rear end bind for drag racing applications.

The arms also include CNC machined 6061 aluminum step bushings and a durable powder coat finish. The QA1 rod end is a 3/4" hard chrome-plated, self-lubricating race rod end, ensuring smooth operation and long life.