I have a 2004 reg cab 4 WD Tacoma. I had to put in a 2.5 inch lift to get my 32x11.50 BFG AT's to fit good. I think if you want to put bigger tires on you should lift it. I did a ToyTec 2.5 spacer and 2 inch schackle lift. It works good but I wish I had gone with the 3 inch spacer.