Couple of points.
Put oil in BEFORE you reinstall the new diff. Its at least eleventy billion times easier.
And make sure you remove the fill plug BEFORE the drain plug. As if you remove the drain plug first, and then find out you can't get the fill plug off, you are stuffed.
MX73's from 1986 onwards have the diff spaced down by ~4mm (different top mount, and holes in subframe have washers in-situ).
So you will need to swap that top mount over.
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