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

...Guitar Jones mentioned to hold one axle still and then to try spinning the other axle. And when i did so i was able to spin the other axle not being held and the pinion also spun while i spun the nonheld axle.

He wouldn't be able to do that if the spiders were welded.

It coudl just be a worn out sure-grip.