I am curious about replacing my rough 4" superlift rear springs with a stock spring sprung over... Would this be a smart decision? Would the lift be about the same or taller? Right now I have the 4" sping and 1/2" shackles with spring under, I want to put the the stock rear spring back on with no shackle lift with spring over! My front is nice but the rear is stiff. I am trying to achieve a softer more flexy rear suspension, would this work?