Hotchkis 1964-1966 GM A-Body Lowering Coil Springs Set (Set of 4)Hotchkis Sport Suspension 19113 1964 1966 GM A Body Lowering Coil Springs Set (4) 2 in Drop (Big Block). Lower your Chevelle El Camino GTO or other 64 66 GM A Body car with Hotchkis Sport Suspension lowering coil springs. These springs will lower your vehicle on average 2 in. from factory ride height enhancing vehicle looks while lowering the center of gravity. The increased spring rates offer improved performance and handling while offering a