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11. Lower the floor jack, allowing the rearend to drop as far as it can. Then re-install the rear coil springs. Cheap Street Chevelle had worn-out rear springs that promoted wheelhop and let the rearend sag below the ride height of the front end. Thus, we upgraded to new heavy-duty 130 in-lb springs from Hotchkis. Re-installing the springs is easy; simply place the spring in its top location and then wedge the spring onto its mounting flange on the rearend housing. Sometimes it's easier to install the springs if a buddy pushes down on the rearend housing slightly as you position the coil spring.