Today i have stripped the differential of the car down to inspect the internal condition. I first cleaned off the loose dirt so no excess dirt fell into the internals. The drive flanges were removed next and inspected, these items looked to be in good condition with minimal surface rust or wear. The studs in the flanges were also in good order except from one which had soke damage on the threaded section so this will need to be replaced.
After the drive flanges were removed i could remove the side of the casing to remove the differential itself.
The teeth on the crown-wheel are in good condition, they show signs of use and some slight wear but they look good and reusable.
The differential support bearings do show signs of wear and will need replacing however, these along with the pinion support bearings. Items such as seals and gaskets should be replaced and the casing will be cleaned and painted in the correct manor.