UMI Performance 65-66 GM B-Body Adjustable Upper Control/Trailing Arm

If you're looking to dial in the rear suspension on your 1965-1970 GM B-Body, like your Chevrolet Bel Air, this adjustable upper control arm from UMI Performance is a solid option. It's designed to directly replace your factory arms, and its main job is to help reduce wheel hop, especially when you're putting down serious power, and to let you fine-tune your pinion angle without having to pull the arm off the car.

What makes this arm stand out is the on-car adjustability. It uses a heat-treated 4140 CrMo adjuster, which is a strong piece that lets you make changes easily. The whole arm is TIG welded for a strong, well-built structure, and it comes with grease-able Energy Suspension polyurethane bushings. These bushings are known for their durability and ability to handle movement while keeping things tight. The arm also has a tough powder coat finish to help it stand up to the elements.

This control arm is sold individually, so make sure you check if your specific B-Body uses one or two upper control arms from the factory. It's designed to work with both 3-link and 4-link rear suspension setups, making it pretty versatile for different builds.