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1968 - 1982 Corvette Specification Guide
(1968-82 Rear Axle Ratios & Identification Codes)

1968-1969 Rear Axle Ratios & Identification Codes

Code Ratio Type
AK 3.36:1 Standard (327/350)
AL 3.08:1 Positraction (327/350)
AM 3.36:1 Positraction (327/350)
AN 3.55:1 Positraction (327/350)
AO 3.70:1 Positraction (327/350)
AP 4.11:1 Positraction (327/350)
AS 3.70:1 Standard (327/350)
AT 3.08:1 Heavy Duty Positraction (427)
AU 3.36:1 Heavy Duty Positraction (427)
AV 3.08:1 Positraction (427)
AW 3.08:1 Heavy Duty Positraction (427)
AY 2.73:1 Heavy Duty Positraction (427 Turbo Hydra-Matic)
AZ 3.55:1 Heavy Duty Positraction (427)
FA 3.70:1 Heavy Duty Positraction (427)
FB 4.11:1 Heavy Duty Positraction (427)
FC 4.56:1 Heavy Duty Positraction (427)

Note:  1968-69 Corvette rear axles were manufactured at Warren and are suffixed "W".  1969 models built after approximately August of 1969 use 1970 coded rear axles.

1970 (& Late 1969) Rear Axle Ratios & Identification Codes

Code Ratio Type
CAK 3.36:1 Standard (350)
CAL 3.08:1 Standard (350)
CAM 3.36:1 Positraction (350)
CAN 3.55:1 Standard (350)
CAO 3.70:1 Positraction (350)
CAP 4.11:1 Standard (350)
CAS 3.70:1 Standard (350)
CAT 3.08:1 Heavy Duty Positraction (454)
CAU 3.36:1 Heavy Duty Positraction (454)
CAV 3.08:1 Standard (454)
CAW 3.08:1 Standard (454)
CAX 3.36:1 Heavy Duty Positraction (454)
CAY 2.73:1  Positraction (454 Turbo Hydra-Matic)
CAZ 3.55:1 Heavy Duty Positraction (454)
CFA 3.70:1 Positraction (454)
CFB 4.11:1 Heavy Duty Positraction (454)
CFC 4.56:1 Heavy Duty Positraction (454)
CLR 3.36:1 Standard (454)

Note:  Positraction became standard equipment on the 1970 Corvette and the inclusion of non-Positraction (standard) axle codes by Chevrolet is in conflict.

1971 Rear Axle Ratios & Identification Codes

Code Ratio
AA 3.55:1
AB 3.70:1
AC 4.11:1
AD 4.56:1
AW 3.08:1
AX 3.36:1
LR 3.36:1

1972 Rear Axle Ratios & Identification Codes

Code Ratio
AA 3.55:1
AB 3.70:1
AC 4.11:1
AX 3.36:1
LR 3.36:1

1973-74 Rear Axle Ratios & Identification Codes

Code Ratio
AA 3.55:1
AB 3.70:1
AC 4.11:1
AW 3.08:1
AX 3.36:1
LR 3.36:1

1975 Rear Axle Ratios & Identification Codes

Code Ratio
AA 3.55:1
AB 3.70:1
AC 4.11:1
AY 2.73:1
AW 3.08:1
AX 3.36:1
LR 3.36:1

1976-77 Rear Axle Ratios & Identification Codes

Code Ratio
OA 3.08:1
OD 3.36:1
LR 3.36:1
OB 3.55:1
OC 3.70:1

1978 Rear Axle Ratios & Identification Codes

Code Ratio
OK 3.08:1
OM 3.36:1
OH 3.55:1
OJ 3.70:1

1979 Rear Axle Ratios & Identification Codes

Code Ratio
OM 3.36:1
OH 3.55:1
OJ 3.70:1

1980 Rear Axle Ratios & Identification Codes

Code Ratio
OF 3.07:1
OH 3.07:1

1981 Rear Axle Ratios & Identification Codes

Code Ratio Equipment
OJ 2.87:1 Automatic Transmission
OK 2.72:1 Manual Transmission

1982 Rear Axle Ratios & Identification Codes

Code Ratio Equipment
OA 2.72:1 Standard Wheels
OF 2.87:1 Aluminum Wheels

Note:  All 1970-1982 Corvette rear axles were Positraction.


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