gwater agree with folks above as it depends on your end goal. Not sure of width of rails on a 40 but if you want to go IFS checkout crown vic ifs swaps on google. the 2003-2006 ifs drops out with only 8 bolts and can be purchased for few hundred bucks. Looks to be an easy swap. Good luck


Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
Things may come to those who wait...but only the things left by those who hustle."-Abraham Lincoln