Good point on the differences in axle setup. One reason I've likely never broken a front shaft, aside from being old and slow and running a 2 Low, is that they are welded 5-760X joints in a non-disco setup. Running a locked D30 with big tires and 260s is a recipe for repair at an inopportune time. I watched a friend of ours do it 3-4 times while in Moab last year. You could almost predict when it was going to happen.