Differential Carrier - Detroit Truetrac - 30 Spline - 3.73 Ratio and Up - Steel - 8.875 in - GM 12-Bolt - Each Brand- DETROIT LOCKER-TRACTECH MPN 913A315 . **NOTE: THIS IS A 4 SERIES CARRIER For A Truck Rear End Truck Freight- NO State Restrictions Canada Restrictions- NO Canada Shipping: Ships to Canada