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 1989 ME9 4 SPD A T THM44OT4 9BHH 2 84 RATIO QBTH 2 97 RATIO 9BXH 2 97 RATIO 9WRH 2 84 RATIO 9WUH 2 97 RATIO 1990 ME9 4 SPD A T THM44OT4 OBHH 2 84 RATIO OBWH 2 97 RATIO OWMH 2 84 RATIO OWPH 2 97 RATIO 1991 M13 4 SPD A T THM 4T6O E 1BC 2 84 RATIO 1BS 3 06 RATIO 1YMW 2 84 RATIO 1YZW 3 06 RATIO 1992 M13 4 SPD A T THM 4T6O E 2YMW 2 84 RATIO 2YZW 3 06 RATIO 2BTW 2 97 RATIO 2CLW 2 84 RATIO 2CSW 3 06 RATIO 2CXW 2 97 RATIO 1992 GENERAL MOTORS SERVICE PARTS 0PERATIONS BUICK 4V4C 4 000 4 4 8 92