Yep the "inner shaft" does come out of the tube. You'll have tah take the whole steering colum off the truck and apart. Service Manual and the Steering rebuild Manual come in real handy.
also you might want tah look at this recent topic:
http://www.stovebolt.com/bboard/cgi-bin//ultimatebb.cgi?ubb=get_topic;f=22;t=001050
Adios, Kip