TRANSMISSION IDENTIFICATION INCLUDING AXLE RATIO TRANSMISSION TO ASSEMBLY CODES 1 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 1991 MD8 4 SPD A T THM7OOR4 1BBM 1BCM 1BFM 1992 MD8 4 SPD A T THMYOOR4 2BWM 2DDM 2BBM 2BAM 2BCM 2BFM 2BHM 1993 MD8 4 SPD A T THMYOOR4 3BAM 3BBM 3BCM 3DDM 3BFM 3BWM 3BHM 3BBM J 1992 GENERAL MOTORS SERVICE PARTS OPERATIONS CHEVROLET 17B j i 4 000 4 2 8 92