I need to lengthen steering shaft

[happyhunky]

Hello, I need to lengthen my collapsible steering shaft. The half to the steering box is 1" dd, and the half to the column is 3/4" dd. It then connects to a 3/4" X 1" dd ujoint to the steering column. My question is, can I separate my two piece steering shaft and put in a longer section of 3/4" dd shaft? Hopefully I can do this so I don't have to mess with more joints. I'm not sure how to separate the two shafts cause trying to pull them apart, they have a stop of some sorts on the end of the 3/4" dd shaft. I need the cheapest route possible. Thanks Lou