I'd shop around. Look around and do a lot of research in the SAS registry section here: http://www.explorerforum.com/forums/forumdisplay.php?f=63. Your fist decision will have to be whether you want full width (from a 1/2 ton+ truck) or narrow width (Early Bronco or Full SIze Jeeps) axles. You will need a front axle with a drivers side drop to line up with a transfer case. You'll have to swap in one from earlier F150s. (90s era I believe but I dont remember the year range or the tcase model but it's a somewhat common mod for 5.0 AWD guys) I'd suggest starting a thread in the modified 2nd gen forum and you can ask questions and have a specific place to keep track of part numbers and decisions/ideas. That's what I did and it made it a lot easier to go through and get parts.