UMI Performance 05-10 Ford Mustang Rear Control Arm KitThe S197 Mustang chassis uses a 3 link rear suspension system which consists of one upper control arm, two lower control arms and a panhard bar to control the rear end under the vehicle. Under hard loads the factory pieces tend to flex and rubber bushings deflect leading to poor traction and erratic handling. Replacing the factory pieces with stronger well designed items eliminates this flex allowing for better control of the vehicle and improved