Your sig line indictaes that you have 34's now- are they worn out? If not, I am not sure that you will notice much difference. I just went from 295/75/16 (33") to 315/75/16 (35") and don't notice a whole lot of difference. I am not really thinking about a re-gear either.
Hilux is correct. They are just 33.6 brand new so they really aren't 34s. More like a fat 33. My 34s are in good shape but since I'm getting gears (5.29). I figured I might as well step up the tires a notch. I was debating 35s to fill the gap a little better but didn't know how bad they would rub.
What do you guys think about 36s with a set of 30mm coil spring spacers? I'm running OME 850/860 springs.