Just so you know F/S axles will make your XJ a skate board,.. Also if you plan on a radius arm F series D44 make sure you dont get the cast wedges,.. look for the olde steep tube with a welded wedge especially if you plan on doing a 4 link front. You can look for my "Blasphemy" Jeep XJ on here that runs a 78 D44 from a Bronco. If I could go back in time I may of went another direction