CORVETTE REAR AXLE IDENTIFICATION V18 Axle Identification is stamped on differential carrier along with date of manufacture Plant Plant Type Identification Type Identification 1955 58 3 Speed or 4 Speed vv Metallic Brakes 3 70 ratio FJ 3Speed AH 3 peed or 4 Speed w Positraction and Powerglide AE Metallic Brakes 3 70 ratio FK 3Speed vv 3 27 ratio AD 3Speed or 4 Speed w Positraction and 3 Speed vv 4 11 ratio A Metallic Brakes 4 11 ratio FL 3 Speed vv Positraction 3 70 ratio AN 3 Speed or 4 Speed w Positraction and 3Speed vv 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 4Speed 3 70 Ratio Al I Positraction 3 70 ratio AN Positraction 4 11 ratio AP 1959 Positraction 4 56 ratio AO Positraction 3 36 ratio AF Positraction w l I D Brake Susp 3 70 ratio AS 3Speed or 4 Speed AH Positraction w H D Brake SusD 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 vv H D Brake Susp and Positraction w Metallic Brakes Positraction 3 70 ratio AS 3 70 ratio FK 3 or 4 Speed vv 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 F 3 or 4 Speed w Positraction and Metallic Brakes 3 70 ratio Fl 3 or 4 Speed w Positraction and Metallic 1962 Brakes 4 11 ratio FL 3 or 4 Speed w Positraction and Metallic 1 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 C CF 4Speed CG w Metallic Brakes 3 36 ratio CH w Metallic Brakes 3 55 ratio CJ 3Speed or 4Speed 3 70 ratio AH Positcractionw Metallic Brakes Powerglide 3 55 ratio AE 33 36 ratio CK Positraction 3 70 ratio AN Positraction w Metallic Brakes Positraction 4 11 ratio AP 3 55 ratio CL Positraction 4 56 ratio AO Positraction w Metallic Brakes 3Speed or 4 Speed vv I I D Brake Susp 13 70 ratio CM and Positraction 3 70 ratio AS Positraction w Metallic Brakes 3Speed 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 vv H D Brake Susp 4 56 ratio CP and Positraction 4 56 ratio AU Positraction w H D Brake Susp CO WAREl IOUSING AND DISTRIBUTION DIVISION OF GENERAL MOTORS CORPORAT ON CHEVROLET l4 tim 29