8 3/4 open to sure-grip swap

I’ve looked around, but haven’t found exactly what I’m looking for. I have a 8 3/4 open in my duster and just purchased a sure-grip unit to install. What all do I need and need to do to install it? I’ll be honest, I don’t have much experience with differentials. I can rebuild a engine, but changing diff oil is about as far as I’ve gotten so far. Any help is appreciated.