Actually, quite a few had them in 72'. My car was originally a 350 2bbl/th350 car and had a factory 2.73 non posi 12 bolt. I would say mostly 6 cylinder and 307 cars had 10 bolts. My 72' Monte was a 350 4bbl and had a 2.73 posi rear factory as well. Every factory big block car I have ever seen had a 12 bolt rear axle from the factory.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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