A I T E N T I O N SOME TRANSAXLES IRANSMISSIONS ARE IMTERCHANGEABLE AS ASSEMBLIES ONLY FROM ONE MODEL YEAR T0 A LATER MODEL YEAR THEREFORE VERIFY MODEL YEAR ON TRANSAXLES TRANSMISSIONS BEFORE ORDERING COMPONENTS FROM THE FOLLOWING CHARTS EXAMPLE 1984 A ME9 W CODE 4BC USE 1984 CHART 1985 A ME9 W CODE 5BC USE 1985 CHART 1986 89 TRANSMISSION IDENTIFICATION DURING THE 1986 MODEL YEAR AND THE START OF 1987 PRODUCTION THE FOLLOWING TRANSMISSIONS WILL HAVE A THREE 3 LETTER CODE AS OPPOSED TO A TWO 2 LETTER CODE PREVIOUSLY USED THE THIRD LETTER IN EACH CODE WILL IDENTIFY TRANSMISSION TYPE 3RD LETTER TRANS TYPE OPTION A 400 M40 B 2OOC MV9 C 1250 MD9 F 200 4R MW9 H 440 T4 ME9 M 700 R4 MD8 Z F I ME9 1990 91 TRANSMISSION IDENTIFICATION DURING THE 1990 91 MODEL YEAR THE TRANSMISSION CHARTS WILL CARRY THE OLD DESIGINAIION CODES ALONG WITH THE NEW HYDRA MATIC DESIG NATION CODES BEGINNING WITH THE MODEL YEAR 1992 ONLY THE HYDRA MATIC DESIGNATION CODES WILL BE USED EXAMPLE HYDRA MATIC 3T40 E 3tI I Q 7 F 7 7 NUMBER OF SPEEDS TYPE SERIES MAJOR FEATURE 3 T TRANSVERSE BASED ON E ELECTRONIC CONTROLS 4 L LONGITUDINAL RELATIVE A ALL WHEEL DRIVE 5 PLUS M MANUAL TORODE HD HEAVY DUTY V CVT CAPACITY TRANS TYPE 3RD LETTER OLD NEW OPTION A 400 3L8O M40 C 125C M 3T4O MD9 F 200 4R MW9 H 440 T4 4T60 ME9 M 700 R4 4L6O MD8 S AWD 3T40 A MD9 W 4T60 E M13 Z F 7 ME9 5TM40 MG1 MG2 MU1 MY5 1991 GENERAL MOTORS SERVICE PARTS OPERATIONS CHEVROLET 17A 5 91 4 67 4 498