I did the Rough Country lift. 2.5, it was the 1/2 inch spacer on top of shock and then the 2 inch U shaped piece that moves the bottom shock up. No rear block change. Its all stock. My truck measures almost level front and back. 39.7 front and 40 inch in center wheel well in the back. This is a picture front stock to leveled to 295/55/20 tires. I also have a YouTube video to show my lift.