ive looked into this also but all i know is that it will take time and effort to put towards. plus knowing what you need for example: a 4wd transmission or put the 4wd housing on the existing tranny, a transfer case, an axle with matching gears and im sure there are some other things you need. i believe you can only use an axle on the driver side. i dont know if thats right and i dont know if that has anything to do with it but thats what ive been told. 03edge im sure could fill in since hes done it...
Estate Green '01 Sport Trac 2wd 4.0: warrior shackles,15x8 pro comp 152's wrapped in 33x12.5 Mastercraft Courser M/T's, Xentek 5000k HiD's, 20% tint, King 2.0 x 6.0 Coilovers, Fox 2.0 x 10 with resi's, shock hoops, boxed and johnny jointed a arms, and foa bumps, coming soon: spindles, and uniball uca's.