The ground clearance numbers are at the rear pumpkin (differential housing).... That has to do with tire size. So any Titan with tires smaller than the Pro4x 33.2" tire will have lower ground clearance. Has nothing to do with the height of the suspension, although I do know the 2WD is lower than the 4WD models. I would bet the 33s will still work on the 2WD models as long as you stick with the stock width. If not, grab some Bilstein 5100s and a small spacer and you'll be set.