I dunno about a full sized dodge. What size tire does the passport have? 31's are what I recomend as minimum. The gearing and limited slip should be good for you though.

1990 RS 4door 3.0L V6. 2 inch body lift. 33x12.50/r15 BFG AT's, 3 Superswampers(1 on the way) CD Player, Superwinch Hubs
My pics http://community.webshots.com/user/nhmonty