CORVETTE REAR AXLE IDENTIFICATION Cont Plant Plant Type Identification Type Identification 1971 Positraction 3 55 ratio AA Positraction 3 08 ratio AW Positraction 3 70 ratio AB Positraction 3 36 ratio AX Positraction 4 11 ratio AC Positraction 3 36 ratio LR Positraction 4 56 ratio AD 1972 75 Positraction 3 36 ratio AX Positraction 3 70 ratio AB Positraction 3 36 ratio LR Positraction 3 55 raitioi AA posmactgon 4 11 ratio AC Positraction 3 08 ratio AW 1974 GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET P A 3OB 113