I GM04 329U RPO DEFINITIONS I I F I7 TRANSAXLE F NAL DRIVE 2 84 RATIO F75 TRANSAXLE FINAL DRIVE 3 18 RATIO MD9 TRANSMISSIONAUTOIVIATIC 3 SPEED I HM125C 3T40 I 1992 GENERAL MOTORS SERVICE PARTS OPERAT ONS CHEVROLET 1TL 4 000 GROUP 4 92 I 1 92