C3 Corvette Transmission Identification Codes
Transmission Production Code Locations
3-Speed - 1968 and 1969: Stamping located on the machined surface on the left side of the case, just below and rear of cover.
Muncie 4-Speed - 1968 through mid 1974: Stamped vertically on the right side of the case at lower rear, just ahead of the transmission extension.
Warner 4-Speed - Mid 1974 through 1981: Stamped at the left side on the top rear of the case. The 1974-77 Warner 4-Speed may also have a two-digit code painted on the left side of the case below the side cover to identify the low gear ratio: HS = 2.64:1 (Wide ratio) HW = 2.43:1 (Close ratio)
Turbo Hydra-Matic 400 - 1968 through 1977: Located on a plate attached to the vertical surface of the transmission case above the right-rear corner of the oil pan.
Turbo Hydra-Matic 350 - 1976 through 1981: Code stamping located on the right-hand vertical surface of the transmission oil pan.
Turbo Hydra-Matic 700R4 - 1982: Code stamping located in the case on the right-hand side of the oil pan.
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1968 Corvette Transmission Codes
Code | Transmission |
S | Saginaw 3-Speed |
P | Muncie 4-Speed |
K | Turbo Hydra-Matic 400 with 327 Engine |
L | Turbo Hydra-Matic 400 with 427 Engine |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1969 Corvette Transmission Codes
Code | Transmission |
S | Saginaw 3-Speed |
P | Muncie 4-Speed |
A | Muncie 4-Speed M20 Wide-Range (2.52:1 1st gear) |
B | Muncie 4-Speed M21 Close-Range (2.20:1 1st gear) |
C | Muncie 4-Speed M22 Close-Range (2.20:1 1st gear) Rock Crusher |
K | Turbo Hydra-Matic 400 with 350 Engine |
L | Turbo Hydra-Matic 400 with 390 & 400 HP Engine |
Y | Turbo Hydra-Matic 400 with 430 & 435 HP Engine |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1970 Corvette Transmission Codes
Code | Transmission |
P | Muncie 4-Speed, Heavy-Duty Aluminum Case |
A | Muncie 4-Speed M20 Wide-Range (2.52:1 1st gear) |
B | Muncie 4-Speed M21 Close-Range (2.20:1 1st gear) |
C | Muncie 4-Speed M22 Close-Range (2.20:1 1st gear) Rock Crusher |
K | Turbo Hydra-Matic 400 with 350 Engine |
S | Turbo Hydra-Matic 400 with 454 Engine |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1971 Corvette Transmission Codes
Code | Transmission |
P | Muncie 4-Speed, Heavy-Duty Aluminum Case |
A | Muncie 4-Speed M20 Wide-Range (2.52:1 1st gear) |
B | Muncie 4-Speed M21 Close-Range (2.20:1 1st gear) |
C | Muncie 4-Speed M22 Close-Range (2.20:1 1st gear) Rock Crusher |
K | Turbo Hydra-Matic 400 with 350 Engine |
S | Turbo Hydra-Matic 400 with 454 Engine |
Y | Turbo Hydra-Matic 400 with 454 LS6 Engine |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1972 Corvette Transmission Codes
Code | Transmission |
P | Muncie 4-Speed, Heavy-Duty Aluminum Case |
A | Muncie 4-Speed M20 Wide-Range (2.52:1 1st gear) |
B | Muncie 4-Speed M21 Close-Range (2.20:1 1st gear) |
C | Muncie 4-Speed M22 Close-Range (2.20:1 1st gear) Rock Crusher |
K | Turbo Hydra-Matic 400 with 350 Engine |
S | Turbo Hydra-Matic 400 with 454 Engine |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1973 Corvette Transmission Codes
Code | Transmission |
P | Muncie 4-Speed, Heavy-Duty Aluminum Case |
A | Muncie 4-Speed M20 Wide-Range (2.52:1 1st gear) |
B | Muncie 4-Speed M21 Close-Range (2.20:1 1st gear) |
CK | Turbo Hydra-Matic 400 with 350 L-48 Engine |
CY | Turbo Hydra-Matic 400 with 350 L-82 Engine |
CS | Turbo Hydra-Matic 400 with 454 Engine |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1974 Corvette Transmission Codes
Code | Transmission |
P | Muncie 4-Speed, Heavy-Duty Aluminum Case |
A | Muncie 4-Speed M20 Wide-Range (2.52:1 1st gear) |
B | Muncie 4-Speed M21 Close-Range (2.20:1 1st gear) |
W | Warner 4-Speed, Heavy-Duty Aluminum Case |
CK | Turbo Hydra-Matic 400 with 350 L-48 Engine |
CZ | Turbo Hydra-Matic 400 with 350 L-82 Engine |
CS | Turbo Hydra-Matic 400 with 454 Engine |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1975 Corvette Transmission Codes
Code | Transmission |
W | Warner 4-Speed, Heavy-Duty Aluminum Case |
CK | Turbo Hydra-Matic 400 with 350 L-48 Engine |
CZ | Turbo Hydra-Matic 400 with 350 L-82 Engine |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1976 Corvette Transmission Codes
Code | Transmission |
W | Warner 4-Speed, Heavy-Duty Aluminum Case |
AM | Turbo Hydra-Matic 350 with 350 L-48 Engine |
XH | Turbo Hydra-Matic 350 with 350 L-48 Engine |
CZ | Turbo Hydra-Matic 400 with 350 L-82 Engine |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1977 Corvette Transmission Codes
Code | Transmission |
W | Warner 4-Speed, Heavy-Duty Aluminum Case |
AM | Turbo Hydra-Matic 350 with 350 L-48 Engine |
CB | Turbo Hydra-Matic 400 with 350 L-82 Engine |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1978 Corvette Transmission Codes
Code | Transmission |
S6 | Warner 4-Speed, Heavy-Duty Aluminum Case, Wide-Ratio (2.85:1 1st Gear) |
ZU | Warner 4-Speed, Heavy-Duty Aluminum Case, Wide-Ratio (2.64:1 1st Gear) |
ZW | Warner 4-Speed, Heavy-Duty Aluminum Case, Close-Ratio (2.43:1 1st Gear) |
5WB | Turbo Hydra-Matic 350 |
5TL | Turbo Hydra-Matic 350 |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1979 Corvette Transmission Codes
Code | Transmission |
UH | Warner 4-Speed, Heavy-Duty Aluminum Case, Wide-Ratio (2.64:1 1st Gear) |
UK | Warner 4-Speed, Heavy-Duty Aluminum Case, Close-Ratio (2.43:1 1st Gear) |
TB | Turbo Hydra-Matic 350 |
WB | Turbo Hydra-Matic 350 |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1980 Corvette Transmission Codes
Code | Transmission |
ZJ | Warner 4-Speed, Heavy-Duty Aluminum Case, Wide-Ratio (2.88:1 1st Gear) |
JC | Turbo Hydra-Matic 350 with 305 California Engine |
TW | Turbo Hydra-Matic 350 with 350 Engine |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1981 Corvette Transmission Codes
Code | Transmission |
CC | Warner 4-Speed, Heavy-Duty Aluminum Case, Wide-Ratio (2.88:1 1st Gear) |
8JD | Turbo Hydra-Matic 350 with 350 Engine |
1968 | 1969 | 1970 | 1971 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
1982 Corvette Transmission Codes
Code | Transmission |
YA | Turbo Hydra-Matic 700-R4 4-Speed Automatic with Overdrive |