2.5 inches is the maximum amount of lift for a 2WD Titan without installing longer upper control arms (either PRG's or Total Chaos), 2 inches is the maximum if you're a 4x4. 3 inches is waay too much with the stock upper control arm, I had (briefly) a 2.5" leveling kit on my 4x4 and there were occassions while off-roading where the upper control arm banged against the coil bucket at full droop. I'd say return it and go to PRGProducts.com to get their leveling kit or go to PRGProducts.com to get some longer upper control arms.
