OK! This is my second diff now.

Yesterday I heard a knocking sound coming from the rear whilst driving up my driveway. I took the car to Hanny's today and my worst fear was confirmed. My diff is about to die.

Now... I have spare diff, I want to rebuild it. I was told that the gears may be OK still. All will be revealed tomorrow when I drop off the spare diff. If the gears need to be changed this will cost $1500.

I would like to rebuild this diff and perhaps improve it's strength. Are there any areas that I could beef up, improve?

Any suggestions are welcome.