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

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, Malibu, Regal, or Grand National, these adjustable upper control arms from UMI Performance are a crucial part of the job. They're built with the correct angles to connect your G-Body chassis to the A-Body rear end, preventing the severe bind and incorrect driveline angles that can happen when using factory arms. This bind leads to lost traction, vibrations, and can make the car handle unsafely.

These control arms are designed for on-car adjustability, letting you dial in the correct pinion angle and make installation easier. You adjust them with a heat-treated 4140 Chrome Moly adjuster, and they feature a QA1 spherical bearing rod end. This rod end allows the rear end to move freely, which is great for high-handling situations like autocross or road racing, and it also helps eliminate rear end bind for better performance in drag racing. The arms themselves are TIG welded and use 4140 Chrome Moly tube adaptors for strong threads, all finished with a durable powder coat.