[Cashburn]

There are many factors that come into play here. However one of the most critical is that the weight of your Backdraft vs. the weight of the BMW the rear was originally intended for. This and the fact that the unit was over-engineered significantly. You can spend a little time on a Bimmer forum and learn how tough these things really are.

You will break a variety of other parts on your car before you will actually break that differential. They have been putting bigger and stronger engines in front of these for years and no actual breakage of the differential has been reported or evidenced.