Boy that's a random question . How about some details like , what size body lift is in the truck ? Are the current springs old and saggy ? Do you have helper springs ( front or back or both ) ? In general with something like a 3" body lift you should be able to run 33's . It also depend on the offset of what ever wheels your running or planning on running . By the way , Welcome to the site . You should introduce your self , were not a bad bunch of guy's . lol