8.75 SureGrip , Is this Normal?

Dartnut said

''Peg leg'' is slang for a single track or non sure grip differential.
I think that the input yoke on the differential should turn by hand with the wheels in the air and the drive shaft unhooked.
It sounds like it's binding if you need to use a tool to turn it.

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Thanks for the explanation Dartnut - now I know! Mine is definitely an LSD though. Unfortunately I will have to pull it out again and check it. I think it has clutches, not cones, because it is all closed up and no springs visible. Maybe the clutches are well worn. Hopefully the service manual can guide me, maybe even someone has done it on YouTube.