If you want to have power "on tap" in a 4Runner, I'm not going to kid around: go with a 3.4 V6. The 3RZ is my favorite Rock Crawling engine that happens to also have good power. When I had 33s I'd attempt races with ricers, when I got 35s I felt I could climb a hill like a Turbo diesel, but the gap from 35 to 37 was a big one and that's where the 3RZ finds it's limit in the hills.
It takes everything it's got to maintain 65 on a grade. This wouldn't be the case with a 3.4.
BigMike
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