In a 4x4 you have to upgrade front and rear diffs. PITA unless you know someone that does them. Z71s should have a 4.10:1 STOCK due to weight issues, if you have the extra cash or are spinning bigger tires... I'd go for it. Consider even a 4.56:1 It's just 100rpm more on a 33" than a 31" on a 4.10:1.

But in a 2x4 I don't think there's enough difference to warrant the cost. I have 4.10:1 gears in my F150 now and I don't think I'd do it again if I had the option. I'd have just gone with the Eaton.