You are gonna need to do alot of things...First of a ring and pinon change....At least 5,38 gears...You don,t have alot of power so the gears will make you roll...You,ll also need to do a front axle swap..Change the transfer case gears or add another box...Check out
www.marlincrawler.com for all the info you will need...I have built three trucks,all of them to run at least 37 inch tires...It,s really not that hard just time consuming...You are looking at about 4 or 5 grand for the swap...Including tires and wheels...