NOT HARD TO REPLACE.THE UNIT BOLTS TOGETHER.JUST REMOVE THE BOLTS AND SPLIT THE HALVES.I NEVER TRIED TO SLIDE THE SPRINGS AND PLATES OUT. I HAVE A DISC BRAKE AXEL FROM AN IMPERIAL IN MY 67 FURY.IF YOU PULL THE UNIT YOU WILL NEED A TOOL FOR THE SIDE ADJUSTERS.JUST CHECK YOUR BACK LASH AND RESET IT.