8.75 SureGrip , Is this Normal?

I just put a 3.23 SureGrip (741 case) centre into my 340 Hardtop. This centre had previously had new carrier bearings fitted and the unit bench checked for normal operation.

With the car on stands and no drive shaft fitted, I noticed some things, can anybody who knows these 8.75 centres tell me if these characteristics are correct please?

With just one axle in (RH side), the axle turns easily with a loud noise coming from inside the housing, like a clicking sound. Nothing else turns. I expected the input part (yoke) to turn also.

With both axles fitted, when one axle is turned, the other axle turns the opposite way. (I thought that Limited Slip diffs should turn the same way, I thought only open centres (non-LSD) turned in opposite directions? Also the yoke does not turn.

Now when the yoke is turned (it is very stiff, it needs a lever to be able to turn it), both axles turn the same way, but can be stopped with your hand, even though the yoke is turning. Is this the LSD clutches or cones working?

Are all these characteristics normal?

Thanks for your help