1983 FRONT AXLE IDENTIFICATION r MODEL CODE RATIO T1 TJA 2 73 A T1 BRW 2 73 T1 GRK 2 73 T1 TMA 3 08 T1 BSX 3 08 T1 GRL 3 08 T1 TWB 3 42 T1 BWF 3 42 T1 GRM 3 42 T1 TBD 3 73 T1 BUJ 3 73 T1 GRN 3 73 T1 MFA 4 11 T1 BTF 4 11 T1 GRP 4 11 I 1984 FRONT AXLE IDENTIFICATION O I MODEL CODE I RATIO T1 BRW 2 73 T1 GRK 2 73 T1 BSX 3 08 T1 GRL 3 08 T1 BWF 3 42 T1 GRM 3 42 T1 BUJ 3 73 T1 GRN I 3 73 T1 BTF 4 11 T1 GRP 4 11 1 1985 FRONT AXLE IDENTIFICATION I MODEL CODE RATIO T1 GBD 3 42 T1 GBF 3 73 T1 GBG 4 11 T1 GAK 3 42 T1 GAL 3 73 T1 GAM 4 11 1986 FRONT AXLE IDENTIFICATION MODEL CODE RATIO K T1 GAK 3 42 T1 GAL 3 73 T1 GAM 4 11 1990 GENERAL MOTORS SERVICE PARTS OPERATIONS LT TRUCK 52S 1 1 I REV 10 90 6 3 6 008