3" travel in the rear is borderline. IF you can get more, get it.
Again ill repeat what Monte always preached. " Shocks make or break it." You need a good shock because the rear is loose and extends fairly fast, you need a stiff compression to keep the tire planted (radials like to bounce back up if not held down) The front needs a good rebound to let the front travle at the correct rate to keep the back planted.

You are at the beginning of needing good shocks to make it run really well


One more thing.....with ladder bars the spring rate means a lot also with seperation. The lighter the rate the faster the rear housing will move ( stored energy) SO if you have a 130lb spring now a 110 or 95 will help the suspension seperate