I don't have a scanner or I would send you the Ford Factory manual showing the procedure. The ring you are refering to is the "Drive Shaft Bearing Retainer Clip" which incircles the splined potion of the axle near its end. This shaft fits into the splined differental side gear and the clip springs into its grooved portion to retain it. You have to overcome this (the clips) interference fit when you pull the joint out. Do not re use this clip. Spend 15 bucks and at least get a Haynes manual.
