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AAM and the GM Corporate Axle Division are basically the same thing as GM just spun it off as a separate company. Most differences between a newer "AAM" axle and older "Corporate" axle have more to do with normal product revisions versus being a different company.
Just like mentioned below the AAM 10.5" rear axle in my 2500HD is the same basic axle as the mid-80's era 14FF in my K5 with the exception of extra ribbing on the diff case and the factory disc brakes.
Speaking of the Eldorado calipers that have a parking brake, I have no personal experience with them but they don't have a very good reputation on the internet in regards to the parking brake working well (everything on the internet is true.....right?). However I don't know if it's more of a matter of improper setup or just how they function by design. Seems like all the factory stuff now uses the "drum in hat" style which has the completely separate mini drum brake for the parking brake.
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