Drive shaft fault
Never seen anything like that Keith,
odd because the force exerted by the load usual ends up screwing the drive shaft off.
I agree with you, this one looks like a longitudinal fault crack. Digging out my basic metallurgy text books it looks like a fault during the forging as a result of differential cooling and or incorrect iron/carbon ratios, basically a bad batch !.
Just as a point of interest, my Father was LAD REME, I remember one of his stories during the Italian campaign was at one point in the winter on 1944 they had a rash of Chevs with broken half shafts, what date was your C60S?
Pete
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