Re: 4\" lift for 35\" tires??
Without the sway bar, I used to rub 33's (32" actual height)on a 4" lift kit. With 5" of lift, my 35's can hit the inner fenders when I'm wheeling. With the swaybar, no problems. I have just been trimming whatever gets mashed by the tires.
This is just my opinion: 4" and 35's looks really good, so the trimming is worth it. 33's look a little small under a 4" lift and 6" is too high just to clear 35's.
The rubbing also depends on the brand of spring (some put the center hole in different places) and the backspacing of your wheels. Also, old body mounts will bring the rubbin on much sooner.