Well, I really cleaned the torque tube good but it was still a no go for a bit. I resorted to using some emery paper until the tube was shiny and with a bit of persuasion, that worked. After that it was a breeze to undo the locks and bolts to pull apart the joint. Thanks for the tip.

OK, now that I have the joint apart... Since it's apart, I know I need to get a new gasket kit for the joint and some new bolts and locks, but should I go ahead and get a U-joint repair kit, or just try to clean up the one I have? At first glance it looks OK, but...

Thank you!