You have to remove the rear tires. Then depending on weather you have rear drum brakes or rear disc brakes you need to do 2 things. if you have rear drum brakes, you remove the rear drums and then you can usually pound the lug bolt stud out with a hammer. You must turn the hub, so it doesn't interfere with the brake shoe mechanisms. then you can install the new lug bolt stud into the new hub. I usually use 2-3 nuts ( lug nuts ) to pull the stud properly into the splines. It takes some real EFFORT.