I bought an ADDCO rear sway bar that is 3/4". The instructions do not indicate if the stock sway bar should be left in or taken out. I don't want the back end going out too quickly on me. At the same time, I am installing a new suspension (springs - 400 lbs in front and 600 lbs in rear). Previously I was using my stock suspension. What do you think I should do about the rear bars?