Just bought a 8 3/4 have a few questions?

The only thing that’s spinning is my head.
Have you ever seen how a differential works? It is a thing to marvel at.
I’m sitting here trying to visualize how the “spider gears” of an “open” will make the other wheel turning the opposite direction if the pinion is held.
I will guarantee that your 7 ¼ was open.
That sort of changes things when you are doing this.
In other words is the pinion being held when you do these things to any given rear end?
Things get confusing.
:toothy10: