The rear springs for 65-70 does not lower the Impala very much. The Impala rear is generally lower then the front originally. By lowering the front with our springs we give the car a slight nose down attitude. We have found that once the total spring package is on the car the lowered look is achieved. In addition we changed the spring rate in the rear, paying attention to spring frequencies. The oscillating problem going over bumps (no matter what shock is used) is eliminated through our selection of spring rates front and rear.