GM77 1981 AXLE IDENTIFICATION CODES A SERIES INDICATES POSITRATIONI 2 29 RATIO 2 41 RATIO 2 56 RATIO CODE RING GEAR CODE RING GEAR CODE RING GEAR AH 7 50 AJ 7 50 AY 7 50 AT 7 50 AZ 7 50 BY 7 50 BH 7 50 BJ 7 50 BT 7 50 BZ 7 50 2 73 RATIO 2 93 RATIO 3 08 RATIO QOE RING GEAR CODE RING GEAR CODE RING GEAR AB 7 50 AG 7 50 AC 7 50 AX 7 50 AW 7 50 AV 7 50 BB 7 50 BG 7 50 BC 7 50 BX 7 50 BW 7 50 RX 7 50 QL23 RATIO CODE RING GEAR AU 7 50 BU 7 50 B SERIES INDICATES POSITRACTIONI QH RAIL 5 RATIO 2 73 RATIO QE IQIG GEAR CODE RING GEAR CODE RING GEAR FA 7 50 GA 7 50 FC 7 50 GF 7 50 HA 7 50 GB 7 50 HF 7 50 LY 8 50 HB 7 50 LA 8 50 YD 8 875 L 7 50 LZ 8 50 YU 8 875 WE 8 875 WC 8 875 WW 8 875 WT 8 875 YE 8 875 YC 8 875 YW 8 875 YT 8 875 2 93 RATIO 3 08 RATIO 3 23 RATIO CODE RING GEAR CODE RING GEAR CODE RING GEAR FB 7 50 LE 8 50 LF 8 50 GG 7 50 LV 8 50 LU 8 50 LW 8 50 WJ 8 875 WK 8 875 WY 8 875 WY 8 875 WZ 8 875 YJ 8 875 YK 8 875 YY 8 875 YZ 8 875 1987 GENERAL MOTORS SERVICE PARTS OPERATIONS OLDSMOBILE 31 it 50