F150 4 wheel drive front axle shifter repair. No 4wd

This is a 2003 F150 7700 4x4 The truck had no 4x4 when I bought it. The front axle was not engaging.  This video is about inspecting the systems and ultimately repairing the front differential shift mechanism to get the 4wd working. I did this job by myself on my driveway in about 2 hours start to finish.  I did not video the wrenching times because, well, my hands were full of wrenches. The intent of the video is to show you what I found and what parts are needed to fix it. The truck has 4x4 working again. Just in time for winter snow and ice. Post if you have any questions. Like and share. Enjoy!