I don't have adjustable lower arms, so I connected the arms to the frame and hoisted the rear end housing in place being very careful to locate it properly, side to side , front to back and at the correct ride height and angle. I then connected the brackets to the arms and positioned them on the axle tubes and tacked them in place. Did a lot of checking to make sure the rear end housing was in the correct position before welding. Also the brackets had to be ground out some to fit the 3" axle tubes on the 12 bolt.