ts I CORVETTE ENGINE SERIES NUMBER AND SUFFIX CHART Cont 1930 TRANSMISSION IDENTIFICATION CODES Mm A SPD MAN ZJ I M33 3 SPD A T JC BUICK MVA 3 SPD A T 4 T N ICHEVJ 1981 TRANSMISSION IDENTIFICATION CODE M18 4 SPD MAN MX3 3 SPD A T I CC BJD 1SB2 TRANSMISSION IDENTIFICATION CODE MDE 4 SPD A T I YA WAREHOUSING AND DISTRIBUTION DIVISION OF GENEFIAI MOTORS CORPORATION CHEVROLET I4A 1 16 REV 12 B3 A 7