the TT driveline. That's pretty severe though...one per event. If you determine that there isn't anything abnormal causing the shaft to break (ie. a misaligned diff., the shaft having undue stress on that one side, your LSD being weak and putting more power to that side, etc.....by the way these are shots in the dark); then what would help the shear strength of the shafts would be to have them (aircraft quality) shot peened. Run on sentences are my specialty. Good luck, Mark