I have 6 inch front tuff country ez rides from ORD and 4 inch shackle flip with 3 inch lift springs from ORD. With my tire carrier, rear bumper, obnoxious cage etc. I got some butt sagg. Do the super shackles go on the shackle flip or the front spring hangers for the rear springs? In the pics it looks like on the rear shackle. How much lift will this give me? Any drawbacks? In case you need more info it has 14 bolt FF, 4 wheel disc brakes, New drivelines. Pinon rotated to point at rear output of transfer case. 37" Krawlers with gratuitous trimming of fenders. Thanks.