Hotchkis Sport Suspension 1900R 1964-1966 GM A-Body Rear Lowering Coil Spring 1 in. Drop. 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 1 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 comfortable ride. Each gray powder coated coil spring is precision wound using the highest quality steel. Specs: 1 in. Lowered Rear. 124-159 lb/in. Single Pig Tail Coil Note: Wagons and El Camino's should not use rear springs without the use of 31750 air bag kit.