In the moment, we have a customer car in the workshop (facility workshop) and have the following problem. the C70 (1) wheel bearing at the front right was renewed due to noise. after a few hundred meters of test drive, the drive shaft was over. all were stunned by the mounter was worried what he should have done wrong. we have the drive shaft built up, facit was, it was torn in the wheel bearing in the area of the gearing. 1 long crack in the circle as if one were winding a thread 3 times drum. there in the half of the crack it is broken at load. you can see at the breaking point that already about 4mm deep corner has come into the crack, therefore it is to be concluded that it is not possible for our assembly (too high turning moment with the twisting moment key?) moreover, I have noticed the torque and angle. we have checked the vehicle history and found that the vehicle before 80.000km / drive was interested in the same shaft drive from me?