i have some 31x10.5or15lt's mud terrains that i want to put on my truck so i took off one of the front weels and held up one of the mud terrains where it would sit if it was mounted on my truck and moved it back and forth to simulate turning and in one direction it touched the brake line. would that be a problem there not much wider than my stock tires just taller.
would i have to modify the break lines at all?

 

No brake line changes are needed -- you're not lifting the truck or changing the steering geometry or limits.

My daughter's 1998 2WD XL Ranger has had 31's on it for years and they rub at full lock if you hit bumps, but that's it. Not sure about a 2004 but you should be okay if you're not thrashing it hard a lot.

 

thx that what i wanted to hear i occasionaly thrash it.
my dad still dosent understand why i want to put all four tires on a 2wd
i told him so the tires will raise the truck on all four corners not just the back 2.