TRANSMISSION IDENTIFICATION INCLUDING AXLE RATIO TRANSMISSION TO ASSEMBLY CODES NOTE Transmission identification can be located in one of three positions on the transmission A Identification plate on side of case B Stamping number on governor cover C Ink stamped on bell housing 1987 MD9 3 SPD A T THM125C MG2 5 SPD MAN 7CRC 3 18 RATIO 7RRB 3 61 RATIO 7CUC 3 18 RATIO 7XBX 3 61 RATIO 7CSC 3 43 RATIO 1988 MD9 3 SPD A T THM125C MG2 5 SPD MAN 8CRC 3 18 RATIO 8XN 3 61 RATIO 8CUC 3 18 RATIO 8ZN S 3 61 RATIO 1989 MD9 3 SPD A T THM125C MG2 5 SPD MAN 9CRC 3 18 RATIO 9XNX 3 61 RATIO QCUC 3 18 RATIO 1990 MD9 3 SPD A T THM125C MG2 5 SPD MAN MY5 5 SPD MAN OLLC 2 84 RATIO OXNX 3 61 RATIO OXEX OLYC 3 18 RATIO 1991 MD9 3 SPD A T 2HM125C MU1 5 SPD MAN MG2 5 SPD MAN 1LLC 2 84 RATIO 1XEX 3 61 RATIO 1XNX 3 61 RATIO ILYC 3 18 RATIO 1992 GENERAL MOTORS SERVICE PARTS OPERAT ONS CHEVROLIET 17L i L92 as 4000