AXLE IDENTIFICATION CODES CONT D INDICATES POSITRACTION 1985 B 2 41 RATIO GU1 OPTION 2 56 RATIO GM8 OPTION 2 73 RATIO GU2 OPTION CODE RING GEAR CODE RING GEAR CODE RING GEAR 4ZF 8 50 8NP 8 50 8NV 8 50 8NU 8 50 8GM 7 50 8YB 8 50 8DU 8 50 8YP 8 50 8FN 7 50 8GN 7 50 BGL 7 50 2 93 RATIO GW9 OPTION 3 08 RATIO GU4 OPTION 3 23 RATIO GU5 OPTION CODE RING GEAR CODE RING GEAR CODE RING GEAR 8NW 8 50 8NX 8 50 8NY 8 50 8YC 8 50 8LG 8 50 8LH 8 50 8YQ 8 50 8YD 8 50 BYE 8 50 8YK 8 50 8YR 8 50 8YS 8 50 8YX 8 50 BGP 7 50 G 2 29 RATIO GH2 OPTION 2 41 RATIO GU1 OPTION 2 56 RATIO GM8 OPTION CODE RING GEAR CODE RING GEAR CODE RING GEAR 8BH 7 50 8BJ 7 50 8BY 7 50 8AH 7 50 8AJ 7 50 8AY 7 50 8BZ 7 50 8AZ 7 50 2 73 RATIO GU2 OPTION 3 08 RATIO GU4 OPTION 3 73 RATIO GT4 OPTION CODE RING GEAR CODE RING GEAR CODE RING GEAR 8BB 7 50 8BC 7 50 5TF 7 50 8AB 7 50 8AC 7 50 5TH 7 50 8BX 7 50 8BV 7 50 QTY 7 625 8AX 7 50 8AV 7 50 1991 GENERAL MOTORS SERVICE PARTS OPERATIONS CHEVROLET 17W 1 5 000 5 10 6 9 1