I have the PRG extra tall lift kit on my and I can clear 37" with a bit of triming on the fender and pinch weld. Talk to Greg from PRG and he can get you additional parts for your kit to get more lift out of it.
Taigon is correct. His set up will work for you to make them fit. You can also add a body lift and avoid some of the suspension upgrades and hassles. Any tire bigger than 37's will cost way too much in mods and cause too much problems down the road. You will love it. Good luck.
A forum community dedicated to Nissan Titan owners and enthusiasts including the 4x4 and XD. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more!