Are you needing to swap the shifter arm from one trans to the other? It's not too bad. Just take a pic of how it went together before you tear it apart. Also remember if the shift lever from the F150 is pointing up or down, they can go either way depending if it's a floor or column shift.
There's a pin in the bottom, directly below the shift lever, that you need to pull out once you're ready to pull it out. The hardest part is getting the large nut loose inside the trans on the other side of the shift lever. And also if the nut on the kick down lever on the outside if it is rusty.
But then again I have only had to do this 3 or 4 times on 2WD transmissions, never a 4WD so I am not sure exactly what you're looking at.