TRANSMISSION IDENTIFICATION INCLUDING AXLE RATIO TRANSMISSION TO ASSEMBLY CODES N0te 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 MD9 3 SPEED A T M13 4 SPEED A T ME9 4 SPEED A T THM125C 3T4O 4T6OE THM44OT4 4T6O 2CHC 2 84 RATIO 2CWW 3 43 RATIO 2YAH 3 33 RATIO 2YBH 3 33 RATIO 1993 MD9 3 SPEED A T M13 4 SPEED A T THM125C 3T4O 4T6OE 3CHC 2 84 RATIO 3CMW 3 33 RATIO 3CWW 3 43 RATIO 1994 M13 4 SPEED A T 4T6OE 4AFW 3 33 RATIO 1993 GENERAL MOTORS SERVICE PARTS OPERATIONS PONTIAC 25W T 4 000 4 6 6 93