Detroit Locker-Tractech Differential - Eaton Posi - 30 Spline - 2.76 to 3.42 Ratio - Limited Slip - Steel - Natural - GM 12-Bolt - 8.875 in - GM Fullsize Truck 1961-80 - Each-19587-010--Notes: State Restrictions- Canada Restriction-NO -Emission Warnings--NO Truck Freight ---NO