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 Monte Carlo, Regal, or El Camino, these adjustable upper control arms from UMI Performance are a critical component. They are built with the correct angles to properly connect to both your G-Body chassis and the A-Body rear end, ensuring your driveline is aligned correctly and preventing rear end bind.

Using factory control arms in this swap will lead to significant issues like traction loss, vibrations, and unsafe handling due to incorrect pinion and driveline angles. These UMI control arms feature on-car adjustability, allowing you to set the precise pinion angle needed for your application. They utilize a 4140 chromoly adjuster and UMI's spherical Roto-Joints, which allow for free rear end movement during spirited driving or racing, effectively eliminating bind. The arms are constructed from strong 4140 chromoly tube adaptors and feature TIG welded construction for durability, all finished with a tough powder coat.

These control arms come fully assembled and ready to install using your OEM hardware. They are a well-built solution to ensure proper alignment and handling when performing a 12-bolt axle swap into your G-Body vehicle.