its simple. Mount the front springs into your new hanger and put the axle and tires back under it. Now put a couple short chunks of 2.4 wood between the shackle ends of the springs and the frame. Now put the vehicle weight onto the tires. Puch on the front bumper a few times to get the springs to settle a bit ontot he wood and mard the centerline of the shackle bolt onto the frame. Now depending on how long of shackles you using measure ahead and mark where the new sleeve will go. I usually run long shackles with the tubes higher up in the frame so I go 1 1/2" forward of the spring bolt centerline.
