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Originally Posted by TK442
Still not having any luck finding a different rear end to bolt up. Surely there's a different A-body that will work that has posi and disc breaks on it. Anyone that could point me in that way that would be great.
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I don't think the '73 to '77 ever came with rear discs. If they did, they're bound to be super rare.
The frame that underpins the '73 to '77 A-body was then used under the '77-up B-body. That's where you'll find your disc brake/posi rear, under a '91-'96 B-body. Your best targets are going to be the '94-'96 Impala SS and '91-'96 9C1 police equipped Caprice. These came with the corporate 10-bolt and rear discs. The Impala SS all had a posi, while most, but not all, of the police package cars did as well. It is not, however, a very robust posi, and I would recommend replacing it with a good aftermarket unit.