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

If you're swapping a 1964-1972 GM A-Body 10-bolt or 12-bolt rear end into your 1978-1988 GM G-Body, like a Regal, Monte Carlo, or El Camino, these adjustable upper control arms from UMI Performance are a critical piece of the puzzle. Trying to use the factory arms during this swap will lead to significant rear end bind, causing issues like lost traction, vibrations, and unstable handling. These arms are specifically built with the correct angles to mate your G-Body chassis to the A-Body rear end, ensuring everything lines up properly.

What really makes these arms stand out is their on-car adjustability. You can easily dial in the correct pinion angle and make any necessary installation adjustments using the heat-treated 4140 chromoly adjuster. The Roto-Joints allow for free movement of the rear end, which is great for high-performance driving like auto-cross or road racing, and also helps eliminate bind during drag racing. The arms themselves are constructed with TIG welded 4140 chromoly tube adaptors for strong threads and finished with a durable powder coat.

These control arms come fully assembled and ready to bolt in, using your OEM hardware. They're a well-built solution designed to make your rear end swap go smoothly and perform correctly.