UMI Performance 73-77 GM A-Body 78-88 G-Body Rear Upper Control Arms Adjustable

If you're working on a classic GM A-Body or G-Body from the 70s and 80s, like a 1977 Buick Regal or a 1985 Chevrolet Monte Carlo, and you want to improve how it handles and launches, these adjustable rear upper control arms from UMI Performance are a solid option. They replace your stock arms to reduce suspension flex, making it easier to set your rear end's pinion angle precisely, which helps put power down more effectively and can reduce wheel hop when you accelerate hard.

These arms are built tough with 1/4-inch thick steel mounting pads that are cut using a CNC laser for accuracy. UMI uses a combination of TIG and MIG welding for strength, and they feature their own Roto-Joint spherical bearings. These joints are designed to allow for easy adjustment of the pinion angle right on the car, without needing to remove the arms. They also incorporate CrMo adjuster sleeves for extra durability and thread strength. The whole assembly gets a durable powder coat finish to resist corrosion and look good.

Installation is straightforward, typically taking 1-2 hours with basic hand tools, and they're designed to bolt right onto various rear end housings. These are a great way to get a more controlled feel on the street, at the strip, or during spirited driving.