If you go back to the last post by
@AuroraGirl and verify that the rings in the last pic are the same as your retaining rings then re-read what she said about using a pic, it may start to make sense to you. You might try posting a pic of your front hub just so we can verify that you have the Warn hubs like she posted. I am fairly certain that you do, that is what came on the half tons in '87, that's what is on my truck. They are a LOT less complicated than the OE Spicer hubs that came on the '77 model.
I just ran (actually waddled) out to get some pics of my picks and my hub so we can help identify what you have and to try to help you better. I strongly recommend you invest in a set of these picks, they are more useful than you can imagine. For that retaining ring they beat the heck out of the little flat bladed screwdriver my Dad used to use on his '77.
You get the end of the ring out using your pick, then a small flat bladed screwdriver between the ring and the outer hub and you have it going your way.
I just checked the Harbor Freight website, the set of picks in the pic (I love typing that!) is $1.99. I don't recall ever getting a tool as useful as this set for $2, not ever.
I do not like that we keep telling you, "Buy this, Buy that" but sadly if you are going to run an older vehicle you have to be willing to invest money in tools and parts and invest your time. Or else have a LOT of money and very, very good mechanic.
You must be registered for see images attach
You must be registered for see images attach