GM Carrier Casting Numbers
Axle Type Casting No. Series Gearing
10 bolt 8.2" ED32118 2 2.73:1 & down
10 bolt 8.2" EDB30116 3 3.08:1 & up
10 bolt 8.5" 410409N 2 2.56:1 & down
10 bolt 8.5" 410408N 3 2.73:1 & up
12 bolt ED32088 2 2.73:1 & down
12 bolt 30140PM1 3 3.08:1 to 3.73:1
12 bolt EDB30174 4 3.90:1 & up