no, actually, in 4wd you get less power to each wheel, because the same amount of power produced by then engine is divided 4 ways. It depends on what traction devices you have as well (lockers, etc). But then again, this is all theoretical, because there will be some loss of power due to slipping and such.
At least thats how it seems it works....Im prob wrong.
I think its the other way around IMO. If you have 3.50 gears in both diffs. and shift into 4wd you would have a total ratio of 7.00, 7.46 if you had 3.73:1 ratio (just in the differentials) I figured it this way..