i would say u can start there, then measure from bottum of leaf spring where it bolts to rear axle. then start measuring from sub frame to ground at front of car. it may actually b a front coil spring that is weak or broke. i had a situation where the back right of car sat about 3/4" higher than left rear of car. i put spacers in the front left coil spring, and balanced the rear within a 1/4".