Swapping to an 8.75 suregrip

When you look down the hole where the axle goes in you should see the head of the thrust button with the little hole in the middle where the "nail" or "Roll Pin"
should be.
ahh yes I see it now, I grabbed a flashlight and rolled it on the side. Also my axles are stock A body 8.75 axles 5x4 bolt pattern