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 1992 ME9 4 SPD A T MD9 3 SPD A T THM440T4 THM125C 2WFH 2 73 RATIO 2BYC 2 73 RATIO 2PDC 2 84 RATIO 1993 ME9 4 SPD A T MD9 3 SPD A T THM44OT4 THMl25C 3WFH 2 73 RATIO 3BYC 2 73 RATIO 3SWC 3 06 RATIO L 1993 GENERAL MOTORS SERV1CE PARTS OPERATIONS BUICK 45A 4 000 4 2 5 93