C3 Corvette Rear Axle Ratios & Identification Codes
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 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'.
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
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.
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
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.
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Code | Ratio |
AA | 3.55 |
AB | 3.70 |
AC | 4.11 |
AD | 4.56 |
AW | 3.08 |
AX | 3.36 |
LR | 3.36 |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Code | Ratio |
AA | 3.55 |
AB | 3.70 |
AC | 4.11 |
AW | 3.08 |
AX | 3.36 |
LR | 3.36 |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Code | Ratio |
AA | 3.55 |
AB | 3.70 |
AC | 4.11 |
AW | 3.08 |
AX | 3.36 |
LR | 3.36 |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Code | Ratio |
AA | 3.55 |
AB | 3.70 |
AC | 4.11 |
AW | 3.08 |
AX | 3.36 |
LR | 3.36 |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Code | Ratio |
AA | 3.55 |
AB | 3.70 |
AC | 4.11 |
AY | 2.73 |
AW | 3.08 |
AX | 3.36 |
LR | 3.36 |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Code | Ratio |
OA | 3.08 |
OD | 3.36 |
LR | 3.36 |
OB | 3.55 |
OC | 3.70 |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Code | Ratio |
OA | 3.08 |
OD | 3.36 |
LR | 3.36 |
OB | 3.55 |
OC | 3.70 |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Code | Ratio |
OK | 3.08 |
OM | 3.36 |
OH | 3.55 |
OJ | 3.70 |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Code | Ratio |
OM | 3.36 |
OH | 3.55 |
OJ | 3.70 |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Code | Ratio |
OF | 3.07 |
OH | 3.07 |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Code | Ratio | Application |
OJ | 2.87 | Automatic Transmission |
OK | 2.72 | Manual Transmission |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Code | Ratio | Application |
OA | 2.72 | Standard Wheels |
OF | 2.87 | Aluminum Wheels |