Keys won't hurt anything as long as you don't crank them up a crazy amount. The only things that really affected are your CV angles and shock travel. Don't go above 2.5" or so on the lift to keep the cv geometry in check, and get longer front shocks. No big deal. (I ran the OEM front shocks at 2.5" lift for over a year before they puked - then I got bilstein 5100s)
Edit: as others have said, spindles are for 2wd only, so that's a no-go.