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1953 - 1967 Corvette Specification Guide 
(1953-67 Rear Axle Ratios & Identification)

1953 Rear Axle Ratios & Identification

Code Ratio Type Application
LW 3.55:1 Standard Early
MW 3.55:1 Standard Late

1954 Rear Axle Ratios & Identification

Code Ratio Type Application
MW 3.55:1 Standard All

1955 Rear Axle Ratios & Identification

Code Ratio Type Application
AE 3.55:1 Standard Powerglide
AH 3.55:1 Standard 3-Speed
AD 3.27:1* Standard 3-Speed

*May not have been used on the 1955 Corvette.

1956 Rear Axle Ratios & Identification

Code Ratio Type Application
AE 3.55:1 Standard Powerglide
AH 3.70:1 Standard 3-Speed
AD 3.27:1 Standard 3-Speed
AJ 4.11:1 Standard 3-Speed

Note:  A very few 1956 Corvettes used Positraction rear axles stamped "3.70.1 HT" or "4.56.1 HT" indicating gear ratio and Hi-Tork.

1957-1958 Rear Axle Ratios & Identification

Code Ratio Type Application
AE 3.36:1 Standard Powerglide
AH 3.70:1 Standard Manual Transmission
AN 3.70:1 Positraction Manual Transmission
AP 4.11:1 Positraction Manual Transmission
AQ 4.56:1 Positraction Manual Transmission
AS 3.70:1 Positraction Manual Trans. & H.D. Brakes & Suspension
AT 4.11:1 Positraction Manual Trans. & H.D. Brakes & Suspension
AU 4.56:1 Positraction Manual Trans. & H.D. Brakes & Suspension

1959-1960 Rear Axle Ratios & Identification

Code Ratio Type Application
AE 3.55:1 Standard Powerglide
AH 3.70:1 Standard Manual Transmission
AN 3.70:1 Positraction Manual Transmission
AP 4.11:1 Positraction Manual Transmission
AQ 4.56:1 Positraction Manual Transmission
AS 3.70:1 Positraction Manual Trans. & H.D. Brakes & Suspension
AT 4.11:1 Positraction Manual Trans. & H.D. Brakes & Suspension
AU 4.56:1 Positraction Manual Trans. & H.D. Brakes & Suspension
FJ 3.70:1 Standard Manual Trans. & Mettalic Brakes
FK 3.70:1 Positraction Manual Trans. & Mettalic Brakes
FL 4.11:1 Positraction Manual Trans. & Mettalic Brakes
FM 4.56:1 Positraction Manual Trans. & Mettalic Brakes

1961 Rear Axle Ratios & Identification

Code Ratio Type Application
AC 3.36:1 Standard 3-Speed
AE 3.55:1 Standard Powerglide
AH 3.70:1 Standard 4-Speed
AN 3.70:1 Positraction Manual Transmission
AP 4.11:1 Positraction Manual Transmission
AQ 4.56:1 Positraction Manual Transmission
AF 3.36:1 Positraction Manual Transmission
AS 3.70:1 Positraction 4-Speed & H.D. Brakes & Suspension
AT 4.11:1 Positraction Manual Trans. & H.D. Brakes & Suspension
AU 4.56:1 Positraction Manual Trans. & H.D. Brakes & Suspension
FJ 3.70:1 Standard 4-Speed & Metallic Brakes
FK 3.70:1 Positraction 4-Speed & Metallic Brakes
FL 4.11:1 Positraction Manual Trans. & Metallic Brakes
FM 4.56:1 Positraction Manual Trans. & Metallic Brakes

1962 Rear Axle Ratios & Identification

Code Ratio Type Application
CA 3.36:1 Standard Manual Transmission or Powerglide
CB 3.36:1 Positraction Manual Transmission or Powerglide
CC 3.55:1 Positraction 4-Speed
CD 3.70:1 Positraction 4-Speed
CE 4.11:1 Positraction 4-Speed
CF 4.56:1 Positraction 4-Speed
CG 3.70:1 Standard 4-Speed
CX* 3.70:1 Standard Close-Ratio 4-Speed
CH 3.36:1 Standard Manual Trans. & Metallic Brakes
CY 3.70:1 Standard 4-Speed & Metallic Brakes
CK 3.36:1 Positraction 4-Speed & Metallic Brakes
CL 3.55:1 Positraction 4-Speed & Metallic Brakes
CM 3.70:1 Positraction 4-Speed & Metallic Brakes
CN 4.11:1 Positraction 4-Speed & Metallic Brakes
CP 4.56:1 Positraction 4-Speed & Metallic Brakes
CQ 3.70:1 Positraction 4-Speed & H.D. Brakes & Suspension
CR 4.11:1 Positraction 4-Speed & H.D. Brakes & Suspension
CS 4.56:1 Positraction 4-Speed & H.D. Brakes & Suspension
CT 3.08:1 Standard 4-Speed
CU 3.08:1 Positraction 4-Speed
CV 3.08:1 Standard 4-Speed & Metallic Brakes
CW 3.08:1 Positraction 4-Speed & Metallic Brakes

* 1962 "CX" code unverified

1963-1964 Rear Axle Ratios & Identification

Code Ratio Type Application
CA 3.36:1 Standard Manual Transmission or Powerglide
CB 3.36:1 Positraction Manual Transmission or Powerglide
CC 3.55:1 Positraction 4-Speed
CD 3.70:1 Positraction 4-Speed
CE 4.11:1 Positraction 4-Speed
CF 4.56:1 Positraction 4-Speed
CJ 3.08:1 Positraction 4-Speed
CX 3.70:1 Standard Close-Ratio 4-Speed
CZ 3.08:1 Standard Wide-Ratio 4-Speed

1965-1967 Rear Axle Ratios & Identification

Code Ratio Type Application
AK 3.36:1 Standard Manual Transmission or Powerglide (327)
AL 3.08:1 Positraction 4-Speed (327)
AM 3.36:1 Positraction Manual Transmission (327)
AN 3.55:1 Positraction 4-Speed (327)
AO 3.70:1 Positraction 4-Speed (327)
AP 4.11:1 Positraction 4-Speed (327)
AQ* 4.56:1 Positraction 4-Speed (327)
AR* 3.08:1 Standard Wide-Ratio 4-Speed (327)
AS 3.70:1 Standard Close-Ratio 4-Speed (327)
AT 3.08:1 Positraction 4-Speed (396/427)
AU 3.36:1 Positraction 4-Speed (396/427)
AZ 3.55:1 Positraction 4-Speed (396/427)
FA 3.70:1 Positraction 4-Speed (396/427)
FB 4.11:1 Positraction 4-Speed (396/427)
FC 4.56:1 Positraction 4-Speed (396/427)

Note:  All 1965-67 Corvette rear axles were manufactured at Warren and are suffixed "W".  (*) Listed 1967 "AQ" and "AR" codes & ratios may only have been used early in the 1967 model-year, or not at all.

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