yes you can . been doing it for 30 + years on race cars . if you only want a ride height adjustment , you can cold bend [in a press] the springs main leaf near the eyes. this way you don't change the whole springs arch but you move the mounting points some... lay them out and pull a straight edge across the eyes and record the actual arch measurement. then make small adjustments at each end until you get about an inch less measurement in the free arch. the best thing about doing it this way is , you don't have to break the springs down to do it