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

1972

 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

1972

 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

1972

 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

1972

 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

1972

 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

1972

 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

1972

 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

1972

 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

1972

 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

1972

 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

1972

 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

1972

 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

1972

 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

1972

 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

1972

 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