What is dangerous?, Well, every mechanism that does not work as a certain danger entails, it is also true that it depends on what mechanism or what piece. I would tell you that it is relatively dangerous, why?, Because if you leave it a lot of time it is possible that at some way out if you spend with the accelerator, you can leave the homokinetic of the stick and you run out of traction in that wheel, apart from keeping in mind that the piece of broken stick would continue to turn until you stop the vehicle hitting the low ones. This is in the most extreme case, in the most likely case it is that if you continue a lot of time with the Palier thus the one that ends up being resorted to is the gearbox.
Try to catch you a reconstructed stick that are cheaper than the new ones, asks in some spare that usually have rebuilt palieres, you deliver your old and give you a new one already arranged and with total guarantee and come out quite well in price.