I just restored my FC-150. Rebuilt every part. Replaced the seats with Ford Focus seats which fit perfect. Runs like new. At 2900 RPM am going 40 mph with F134 engine. I am going to add a overdrive unt as sold by Kaiser Willys. No problem adding the unit to the transfer case but I am going to have to design the shift linkage. Has anyone done this? I have a complete machine shop to make the linkage one I figure what it looks like. Any suggestions would be appreciated.