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Strange thing is that only ujoints closest to the tcase break 98% of the time , even though ujoints are same front and rear. When installing new shaft it slides easy the initial(worn ) area , and becomes much tighter once it enters the unused splines in the tcase. With a tiny 15-20mm of the work surface that stock shaft offers you will inevitably put wear in both shaft and tcase female splines. Over time stock shaft becomes tapered and wears the splines accordingly. This will create vibrations and major stress /excessive wear on the ujoint closest to the tcase. Attached drawing is a very rough sketch of what is taking place.
PS e53 shaft issue is unrelated to this , splines there completely strip out but these shafts dont have ujoints to transfer all the stress to, hence severe spline damage/wear
PPS shaft in the picture is f15 about 42k mile shaft
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