3020 - 1978-1987 GM G-Body Rear Lift Bar Set-UpThe UMI Performance lift bars replace your stock rear control arms adding tremendous track gains while not effecting ride height and keeping ride quality at its best. Lift bars are designed to work with axle torque to load the chassis of the car, forcing the rear wheels downward while pushing the tires into the ground for harder launches and improved 60 foot times. These bars are designed to greatly improve traction and reduce unwanted wheel hop.