Thanks for confirming the "green clip" on your axle shaft. I know from the previous owner's service records the axle shaft(s) were replaced. The more I think about this, the more I believe whomever replaced the shaft had the same Motorcraft set of clips as you describe and decided to put both clips on the axle shaft. They probably managed to ram the shaft home and this was what made it so difficult to pry loose. When I did manage to get it loose, the wire clip, trying to share the groove space with the green one, was dislodged from the end of the axle and fell off when the axle was being removed. I really appreciate the replies to this question.