Beware judgements based on noise in the drive train. I once installed a diff out of a wreck and it made my new clutch sound like it had just disintegrated. Fairdinkum to the driver it was exactly like the noise was from the bellhousing.
No way was it the rear end.
the fix was to add some diff-additive to the rear end. Sorted that **** right out, no worries for years since.