chrisroberts37

I've attached a few pics of the whole thing together and apart.

I have the above gearbox fitted to my Lamborghini engine. The gearbox has a single nut holding the coupling on the drive shaft which when coupled to the the prop shaft is inside the two couplings. Problem is the nut keeps undoing itself and the drive shaft parts when I put in reverse leaving mm email with no drive at all forward or backwards. I have to take it apart every home it happens , tighten the nut, put lcktite on a bed burr the ends but to no avail. After a while it comes apart again as the nut had loosened and fell off. What can I do to stop this happening?