Hello I'm new here. I have an 81 k10 sub with a 350 4x4 with auto front hubs on a 10bolt. My question for anyone that can help is 2 parts. First how the hell do you get the front rotors off? Do I have to take out the hubs or what? Second I am going to lift the front 3" with new springs and the back 4". So in the rear can I do a 2" block with a 2" add-a-leaf and put shims in to help the rear anglr? I am just not sure if you can use this combo for the rear lift.