91- i'm currently doing a frame off of my 78 f-100 2wd and as far as the r/a bushings, the brackets should be bolted to frame so that was easy when i went to install them (see if yours is bolted on too), if not, the i-beams would have to come out. its not that difficult because its all bolt to frame as far as removing brake lines, springs, tie rods, etc. Taking the old bushings off the bed required me to grind off the old bolts in bed because i could not break them loose, i think the cab could probably be raised about 6-10" to do what you got to do (maybe more) make sure everything is unbolted as far as linkages, hoses, steering column? (maybe). behind the seat are two access panels on floor that you can get to two of them, two more under floor pan, there is access panel under wheel well behind tire. the other two are near the front bumper. let more know if you need more info.