C3 Corvette Differential and Axle Codes 1977 to 1982

1968 Corvette Axle Ratios

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

Note: 1968 C3 Differentials were manufactured at Warren and are suffixed 'W'.

Home

Site Map

1969 Corvette Axle Ratios

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

Note: Most 1969 C3 Differentials were manufactured at Warren and are suffixed 'W'.

1969 models built after approximately August of 1969 use 1970 coded differentials.

Home

Site Map

1970 Corvette (Late 1969) Axle Ratios

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

Note: Positraction became standard equipment in 1970 and the reference of Standard axle codes is in conflict.

Home

Site Map

1971 Corvette Axle Ratios

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

Home

Site Map

1972 Corvette Axle Ratios

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

Home

Site Map

1973 Corvette Axle Ratios

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

Home

Site Map

1974 Corvette Axle Ratios

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

Home

Site Map

1975 Corvette Axle Ratios

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

Home

Site Map

1976 Corvette Axle Ratios

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

Home

Site Map

1977 Corvette Axle Ratios

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

Home

Site Map

1978 Corvette Axle Ratios

Code	Ratio
OK	3.08
OM	3.36
OH	3.55
OJ	3.70

Home

Site Map

1979 Corvette Axle Ratios

Code	Ratio
OM	3.36
OH	3.55
OJ	3.70

Home

Site Map

1980 Corvette Axle Ratios

Code	Ratio
OF	3.07
OH	3.07

Home

Site Map

1981 Corvette Axle Ratios

Code	Ratio	Application
OJ	2.87	Automatic Transmission
OK	2.72	Manual Transmission

Home

Site Map

1982 Corvette Axle Ratios

Code	Ratio	Application
OA	2.72	Standard Wheels
OF	2.87	Aluminum Wheels

Home

Site Map