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You can try some WD-40 the noise is caused from the bushings getting worn out

Loud clunking noise in the diff is normally caused from old or worn fluid in the differential its normal to have a small amount of noise from the gear moving.

Loud noise can indicate no fluid or worn bearings which will need to be serviced. Start by changing the fluid in the rear diff check the old fluid if there is any for metal shavings if so you will need to service the differential.

30 w motor oil fill/ck plug should be half way up the rear end cover.

The bushing are quite difficult unless you have done it before. I would do the wd40 first

This may clear up all noise

There will be a drain plug lower

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