A step forward is an achievement. A lot of time, it is a whole lot better to use a press to ease U-joints out. I still use a hammer and a section of Chrysler torsion bar, and the chain pocket on the trailer to drive out U-joints. Sometimes it works well, sometimes it takes the above tools, and a few choice words. I would much rather do older vehicle U-joints much more than newer aluminum drive shafts. Old iron holds together much better than modern crap.