The next step is to remove your stock rear drum brakes. This means you need to put the truck up on jack-stands, remove the wheels and the drum. Then you'll need to either cut off the backing plate, or pull the axles to unbolt the backing plate. To do this, take off your diff cover, rotate until you see the small bolt holding the center pin in. Remove this and pull the center pin. Then push in the axles till they stop, and you'll see the c-clips to remove. Remove these then pull the axles out. Now unbolt the backing plate. Please note, you'll need an oil pan beneath the diff cover when you remove it, and you'll need to replace the oil once you reinstall everything.