TRANSMISSION IDENTIFICATION INCLUDES 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 1984 M40 4 SPD A T MW9 4 SPD A T W OVRDRIVE THM4OO THM2004R AD AN AA AP OM 1985 MW9 4 SPD A T W OVPDRIVE THM2004R AA AP OM AO AB 1986 MW9 4 SPD A T W OVERDRIVE THM2004R 6AH 6KC 1987 MW9 4 SPD A T W OVERDRIVE THM2004R GAH 7KJF 1988 MW9 4 SPD A T W OVERDRIVE M40 3 SPD A T THM2004R 8AHA BKJF 8KTF 1989 MW9 4 SPD A T W OVERDRIVE M40 3 SPD A T THM2004R 9AHA BKJF QKTP t 1992 GENERAL MOTORS SERVICE PARTS OPEERATIONS CADILLAC 62D j 1 1 92 4 3 4 000