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447 is for Saginaw S44 - 1350 I believe. Either way that's the one I have. I think the '70s trucks with external clips use 1310 series joints, and those are a different number from what I've read here before.
I have an '84 truck with the stock shaft and a 14 bolt SF. I used the 447 joint. My truck originally had a 10 bolt rear.
Tim
'84 Chevy K10, lifted, loud, fast, and 3/4 ton axles