F TRANSMISSION IDENTIFICATION 1 TRANSMISSION TO ASSEMBLY CODES CON D Note Transmission identification can be located in one of three positions on the transmission W A Identification plate on side of case B Stamping number on governor cover C Ink stamped on bell housing 199O MD9 3 SPD A T THM125C OBUC 2 39 RATIO OKDC 2 84 RATIO OPNC 2 84 RATIO 1991 MD9 3 SPD A T THM125C 1KDC 2 84 RATIO 1BUC 2 39 RATIO 1 1991 GENERAL MOTORS SERVICE PARTS OPERATlONS BUlCK 44N 4 000 44 2 91