3 inch wont be enough to not rub in the front. ill post pics of my truck and what I had to do to make it not rub! my lift said it was only a 2inch lift all the way around but lifted 3.5front and 2rear.
I still had to trim and remove the mud flaps and it still occassionally rubs with my toyo mudders. Small price to pay to be about 4 inches taller in the front.