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Well since no one answered your question as to what caused it, I will tell you what caused mine to break.
The rear end twist's up when applying torque to it.
In my case I didn't have a pinion snubber or traction bars,also weak leaf springs.
This allowed the rear to twist enough that the drive shaft would break the tail shaft housing because of the mis-alignment. Example( put a long pole on the tail shaft and lift up ..snap)
Do you have a snubber? how far from the floor pan is it?
Hope this helps, and yes go back through the trans. just to be safe.

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ok i try to answer it,
i think he left so hard that the trans fluid filled the tailshaft up, and with the rotation of the rear shaft it build up pressure, and it had no way to vent the pressure so it had to break the rear case!!
hahhah lol