the shock crossmember is strong enough to allow the shock to cycle without taking any weight , any shock that lifts the car at all will transfer weight from the spring perches to the shock crossmember which is not a good idea . The only shocks that lift the rear are weight bearing like the coil over type or air shocks , anything else gas type or basic hyd will not lift the car at all . To properly lift the rear you can add a leaf or replace the springs .