That depends on you,have you tubbed it? If you have plans to shorten a rear you can fit a 14x32x15 on it.........hope you have a motor to turn those steamrollers,if only stock suspension maybe a 245/60/14 could work with a 3.5 or 4" b/s.,8 '" wheel
Wildman: (and every other person who aspires to maximize tire size)
Look to Jeg's web site (jegs.com) for part number 760-01201. It is a plastic wheel tire fitment device that allows you to see what the biggest rubber, wheel, back-spacing you can have without clearance problems. Cost is $89.99 from the WheelRite Company for a mandrel which would have cost you $500 last year for the same thing made out of cast aluminum.
Even then remember the saying "Measure everything twice, and buy only once!"
Just wanted to let you guys know that the Tire MountMate is still available from WheelWorks, Inc. The plastic tool from Jegs has a short little wire that pretends to be a tire. The TMM will hold an actual tire in place and either squeeze or spread the beads if needed to give you an accurate visual on where the tire will sit. You can use it on the front as well and turn lock-to-lock. www.wheelworksinc.com