I came across an R31 Silhouette being wrecked and grabbed the diff from it (see: here). The ring and pinion gears are stuffed (pinion especially), its a 3.7 ratio (which is not what i'd want to use).

As i understand these are 78 series Borg Warner models. As are the live axle Commodore diffs. Can the 28 spline axles and centre from a Commodore diff be used in these housings? Or if i am getting it shortened would i be better off getting a Commodore diff and getting 4 stud hubs fit onto those axles?

Or should i just get a new 3.9 centre for this diff (would that just involve getting new ring and pinion?) and get this one shortened?