I have my front end apart and its been over 30 years since I did this. I'm a slow worker. How do I determine the left from the right especially the housings and axles. On the outer bell housing I see a letter Z on one and a letter R on the other. They are cast into the housing. My universals are 4 ball and I'm told they are the Bendix type and not the Rzeppa type. Something about the latter having 6 balls. any information is helpful. I can be reached at email address <a href="mailto:[email protected]][email protected][/url]