The stockers will work, but you'll lose "droop" or downward suspension travel. I've noticed this with even just 3/4" of lift (FJ coils) in the rear while off-roading. Even dropping a front tire off of a small obstacle tends to lift the opposite rear tire off the ground. I will say, however, that a lot of people have used the Daystar 2.5/1.5 and Cornfed 3/2 spacer lifts on stock suspension without problem and have enjoyed them for years. You'll be fine unless you're trying to improve your flex.