8 3/4...School Me...

I feel stupid asking this but I'm unfamiliar with 8 3/4 rear's and need help! This is a posi with 3.91 gears (thats the extent of my knowledge). The thing is, I dont know what kind of posi it is...can anyone help. I figured if I'm gunna learn about it what better place then FABO!

The reason I ask is because it needs a rebuild kit and I need to get axles!


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