It's too bad most of us A & G body guys don't have a few more options available. In my neck of the woods there are very few GN/442 cars let alone one that's ready to cough up a rear, and even fewer 12-bolt rears. I'm not 100%, but did I read that the 12-bolt started in 65, and there were few of them. Unlike the other Pontiac models withe 8.2 and 8.5 rears, it gets costly to upgrade.
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