This is an Original GM T-10 Manual Transmission Output Tail Housing for 1961 and 1962 Corvette, Impala, Impala SS, Biscayne, BelAir, Grand Prix, Bonneville, and Catalina. The Casting # T10-7D, and Date Code of 10 3 61 are clearly visible. Note that this has a Left Hand Speedometer Gear Mounting, there are no cracks on this housing, See Pictures