Won't effect on road driving really as ATB diffs are pretty much completely transperant until one wheel starts to spin.
If you went with a ATB in the front and something like a Detroit locker in the rear, you'd probably feel a difference alright.
I have a tru-trac to put in the front soon when I get a locker for the rear. Mines a 110 though so the longer wheelbase will lessen any noticeable effects on the road.