CORVETTE REAR AXLE IDENTIFICATION A Axle Identification is stamped on differential carrier along with date of manufacture Plant Plant Typg Identification Type d8 tifi tI 1955 53 3 Speed or 4 Speed w Metallic Brakes 3 70 ratio FJ 3 Speed AH 3 p d or 4 peed vv Positraction and powergude AE Metallic Brakes 3 70 ratio FK 3Speed w 3 27 ratio AD 3 peed or 4 Speed vv Positraction and 3 Spe d W 4 11 ratio AJ Metallic Brakes 4 11 ratio FL 3 Speed w Positraction 3 70 ratio AN 3 Speed or 4 Speed w Positraction and 3 Speed w Positraction 4 11 ratio AP Metallic Brakes 4 56 ratio FM 3Speed vv Positraction 4 56 ratio AO Heavy Duty Brake Suspension w Positraction 3 70 ratio AS Heavy Duty Brake Suspension 1961 w Positraction 4 11 ratio AT Heavy Duty Brake Suspension vv Positraction 4 56 ratio AU 3 Speed 3 36 ratio AC Powerglide 3 55 ratio AE 4 Speed 3 70 Ratio AH Positraction 3 70 ra1 i0 AN Positraction 4 11 ratio AP 1959 Positraction 4 56 ratio AO Positraction 3 36 ratio AF Positraction w H D lBrake Susp 3 70 ratio AS 3Speed or 4 Speed AH Positraction w H D Brake Susll Powerglide AE 4 11 ratio AT 3 or 4 Speed w Positraction 3 70 ratio AN Positraction w H D Brake Susp 3 or 4 Speed w Positraction 4 11 ratio AP 4 56 ratio AU 3 or 4 Speed w Positraction 4 56 ratio AO Metallic Brakes 3 70 ratio FJ 3 or 4 Speed w H D Brake Susp and Positraction w Metalllic Brakes Positraction 3 70 ratio AS 3 70 ratio FK 3 or 4 Speed w H D Brake Susp and Positraction w Metallic Brakes Positraction 4 11 ratio AT 4 11 ratio FL 3 or 4 Speed w H D Brake Susp and Positraction w Metallic Brakes Positraction 4 56 ratio AV 4 56 ratio FM 3 or 4 Speed w Metallic Brakes FJ 3 or 4 Speed w Positraction and Metallic Brakes 3 70 ratio FK 3 or 4 Speed w Positraction and Metallic 1962 Brakes 4 11 ratio FL 3 or 4 Speed w Positraction and Metallic Q Brakes 4 56 ratio FM 3 Speed 3 36 ratio CA Positraction 3 36 ratio CB Positraction 3 55 ratio CC Positraction 3 70 ratio CD Positraction 4 11 ratio CE 1960 Positraction 4 56 ratio I CF 4Speed CG w Metallic Brakes 3 36 ratio CH w Metallic Brakes 3 55 ratio CJ 3 Speed or 4 Speed 3 70 ratio AH Positraction w Metallic Brakes Powerglide 3 55 ratio AE 23 36 ratio CK Positraction 3 70 ratio AN Positraction w Metallic Brakes Positraction 4 11 ratio AP 33 55 ratio CL Positraction 4 56 ratio AO Positraction w Metallic Brakes 3Speed or 4 Speed w H D Brake Susp 3 70 ratio CM and Positraction 3 70 ratio AS Positraction w Metallic Brakes 3 Speed or 4 Speed w H D Brake Susp 4 11 ratio CN and Positraction 4 11 ratio AT Positraction w Metallic Brakes 3Speed or 4 Speed w H D Brake Susp 4 56 ratio CP and Positraction 4 56 ratio AU Positraction w H D Brake Susp CO 1974 GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET P A 3OB 11