I currently have the 7.5" rear and I am going to install the 8.8" Do I need to put on the 8.8 upper and lower control arms or will the 8.8 bolt up to the upper and lower control arms that are on the 7.5 now, I saw that the lower control arms have holes drilled in them where a rear swaybar should mount so I am guessing that the control arms are the same for both 7.5" and 8.8 ? Thanks for the help!