'67 XKE rear diff?

[wangdango]

I changed the rear diff oil today and had both rear wheels up on jack stands. While it was up I rotated the rear wheels to check for brake drag, and while there was none, there was some resistance to rotate the wheels front and backward. My understanding is this is a limited slip diff and therefore is correct?
Any thoughts?
Thanks
Ed

 

[Grantura_MKI]

As it should be.

 

[Brinkerhoff]

Yes all the parts are turning inside just like they should be.