UMI Performance 64-67 GM A-Body Adjustable Upper Control Arms - Ultimate Arms

UMI Performance is known for making well-built suspension components for classic American muscle cars. If you're working on the rear suspension of your 1964-1967 GM A-Body vehicle, like a Chevelle, GTO, or Skylark, these Ultimate Arms are designed to give you precise control over your setup. They allow you to make adjustments to your pinion angle right on the car, which is crucial for dialing in traction and reducing wheel hop, especially when you've lowered the vehicle.

These aren't just any control arms; UMI didn't cut any corners here. They've beefed up common weak points by using aircraft-quality 4140 chromoly steel for the threaded tube adapters and the solid adjuster. The adjuster itself is heat-treated for extra strength. The construction is fully welded with precision CNC machining throughout, and they even include CNC machined 6061 aluminum step bushings. For smooth, bind-free operation, they feature QA1 rod ends with a Teflon/Kevlar liner, which is a great upgrade for both street driving and autocross use. The whole assembly is finished with a durable powder coat.

The real advantage here is the on-car adjustability. You can easily loosen the jam nuts and turn the adjuster to lengthen or shorten the arm, letting you fine-tune your pinion angle without removing the parts. This makes it much simpler to get your suspension dialed in at the track or even in your garage.