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One major improvement over stock is the ability to pivot at the frame without adding excessive loads on the frame mount. Global West uses a Teflon lined spherical bearing instead of rubber or polyurethane bushing. The bearing allows the arm to pivot, tilt, and swing slightly side to side (because of the pan hard rod) without putting additional stresses on the frame mount. This concept frees up the suspension from bind.The rear end side, the arm is built with a rubber bushing.Here is WHY!Rubber will provide lateral movement that is required because of the panhard rod. In 1959 through 1964, the factory used a panhard rod to control the rear end side to side movement. Unfortunately, the panhard rod is fairly short. As the rear end moves up and down, it also moves slightly left and right because of the arc of the panhard rod. Because we use rubber at this location the rear end can move in its intended path without bind. If polyurethane was used, it would restrict the movement.Another benefit is a rotating spring cushion for indexing the coil spring. The spring cushion can be rotated during assembly for proper index. So if you trimmed the spring for lowering you can still get a good index between the upper and lower spring mounts.They also have provisions for clamping the parking brake cable to them just as the factory did.Spherical bearing in the front mounts to allow the arm to pivot up and down with no bind and rear rubber bushingRotating spring cushionDirect bolt onfully assembledWatch the product overview video above for more information.Experience Unmatched Performance with 1958-1964 GM Impala Biscayne Rear Lower Tubular Control ArmsAt Global West, we are committed to delivering top-notch quality and performance for your classic American Muscle Cars. Our Rear Lower Tubular Control Arms for 1958-1964 GM Impala and Biscayne, part number TBC-84, are a testament to this commitment. These components are meticulously engineered to enhance your vehicles suspension system, providing a smoother and more controlled ride. The use of a Teflon lined spherical bearing instead of traditional rubber or polyurethane bushing allows for a more flexible and stress-free suspension movement. Furthermore, the rotating spring cushion feature ensures proper alignment of the coil spring, even if youve trimmed the spring for lowering.Our products are not just about superior quality and performance, they also come with comprehensive DIY instructions and video tutorials to assist you in the installation process. And if you ever need additional help, our dedicated customer support team is always on standby to provide personal assistance.Global West is not just a brand, its a promise of quality, performance, and unmatched customer service. We invite you to explore more about ourChevrolet Parts Online, or delve into specific components for your classic Chevy with our1958-64 Chevy Parts. For those looking to enhance their Impalas suspension system, our1958-64 Impala Suspensioncategory offers a wide range of high-quality components.