Is my diff loose

A&Q about 350Z
Q:

Hi, just wondering if i should be able to rock the diff i.e. wiggle it. Car is a mk2 16valver. If i should not what can i do to fix it.
Thanks.
A:

rock the diff as in waggle the driveshafts?
diff bearings knackered if so
if rocking as in rotating wheel fwd & back they will always have some slack in crownwheel/pinion
A:

If i grab both drive cups i can rock the diff.
A:

ah 020 pinned diffs.........just a matter of time
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