Straight Axle would cost. I know Tacoma's have some 6" lift options like the Trailmaster, Procomp, and others but none for the 3rd gen 4Runner. My daughter is 14 and in a few years will need a car. I might just dump her the 4Runner and get me a Tacoma. By then I would be ready to hand over to another generation the 4Runner. Of course daddy will make sure it is kept in offroad ready shape, not a freakin boyfriend ride. LOL.
I love the 4Runner cause it's roomy.