Turbo Hydramatic 400

Only those Chevelles I have documented via build sheet or other paperwork is listed here. There are certainly other Chevrolet models that may use the same transmission code tag.

Julian date calendar - leap years (1964-1968-1972) - non-leap years

Code/Engine	Year/HP
CC - 396/402	1967, 1968, 1969 - 325hp
CD - 396/402	1968 - 350hp 1970 - 330hp (LS3) 1971 - 300hp 1972 - 240hp
CE - 396/402	1969 - 350hp
CF - 402/454	1970 - 350hp 1971 - 365hp 1972 - 240hp
CR - 454	1970 - 360hp (found on Van Nuys LS5s prior to at least 01-14)
CS - 454	1970 - 360hp
CW - 402	1970 - 375hp
CX - 396	1969 - 375hp (also reported on 1969 427 COPO)
CY - 454 (high shift point)	1970 - 450hp

(Note: List is not complete but data collection are ongoing.)

Identification tag

A small metal tag is affixed to the passenger side of the transmission just above the pan rail. This identified the model year, engine type, date, and transmission serial number.

501 ~ May 16, 1967 (501st day from January 1, 1966)
CC ~ 396 (325hp)
67 ~ 1967
13884 ~ Transmission serial number

1968

282 ~ October 9, 1967 (282nd day from Jan 1, 1967)
CC ~ 396 (325hp)
68 ~ 1968
5813 ~ Transmission serial number

337 ~ December 3, 1967 (337th day from Jan 1, 1967)
CC ~ 396 (325hp)
68 ~ 1968
25916 ~ Transmission Serial Number

490 ~ May 4, 1968 (490th day from January 1, 1967)
CD ~ 396 (350hp)
68 ~ 1968
25998 ~ Transmission serial number

531 ~ June 14, 1968 (531st day from January 1, 1967)
CD ~ 396 (350hp)
68 ~ 1968
309469 ~ Transmission serial number

538 ~ June 21, 1968 (538th day from January 1, 1967)
CC ~ 396 (325hp)
68 ~ 1968
60372 ~ Transmission serial number

545 ~ June 28, 1968 (545th day from January 1, 1967)
CC ~ 396 (325hp)
68 ~ 1968
26734 ~ Transmission serial number

1969

228 ~ August 15, 1968 (228th day from January 1, 1968 - leap year)
CC ~ 396/402 (325hp)
69 ~ 1969
2028 ~ Transmission serial number

243 ~ August 30, 1968 (243rd day from January 1, 1968 - leap year)
CC ~ 396/402  (325hp)
69 ~ 1969
2247 ~ Transmission serial number

205 ~ July 23, 1968 (205th day from January 1, 1968 - leap year)
CE ~ 396/402  (350hp)
69 ~ 1969
1071 ~ Transmission serial number

205 ~ July 23, 1968 (205th day from January 1, 1968 - leap year)
CE ~ 396/402 (350hp)
69 ~ 1969
1161 ~ Transmission serial number

290 ~ October 17, 1968 (290th day from January 1, 1968 - leap year)
CE ~ 396/402 (350hp)
69 ~ 1969
1882 ~ Transmission serial number

395 ~ January 29, 1969 (395th day from January 1, 1968 - leap year)
CX ~ 396/402 & 427 (375hp)
69 ~ 1969
2147 ~ Transmission serial number

547 ~ June 30, 1969 (547th day from January 1, 1968 - leap year)
CC ~ 396/402 (325hp)
69 ~ 1969
27014 ~ Transmission serial number

563 ~ July 16, 1969 563rd day from January 1, 1968 - leap year)
CX ~ 396/402 (375hp)
69 ~ 1969
4528 ~ Transmission serial number

1970

304 ~ October 31, 1969 (304th day from Jan 1, 1969)
70 ~ 1970
CF ~ 402 (350hp)
8569 ~ Transmission serial number

388 ~ January 23, 1970 (388th day from Jan 1, 1969)
70 ~ 1970
CS ~ 454 (360hp)
2614 ~ Transmission serial number

281 ~ October 8, 1969 (281st day from Jan 1, 1969)
70 ~ 1970
CY ~ 396/402 & 454  (high shift point) (375hp & 450hp)
2683 ~ Transmission serial number

413 ~ February 17, 1970 (413th day from Jan 1, 1969)
70 ~ 1970
CY ~ 396/402 & 454 high shift point (375hp & 450hp)
1928 ~ Transmission serial number

419 ~ February 23, 1970 (419th day from Jan 1, 1969)
70 ~ 1970
CF ~ 402 (350hp)
21430 ~ Transmission serial number

441 ~ March 17, 1970 (441st day from Jan 1, 1969)
70 ~ 1970
CY ~ 396/402 & 454 high shift point (375hp & 450hp)
24414 ~ Transmission serial number
Known to be fake and on an original SS396 car as a CF coded tag and being sold as an LS6. Buyer beware!

469 ~April 14, 1970 (469th day from Jan 1, 1969)
70 ~ 1970
CY ~ 396/402 & 454 high shift point (375hp & 450hp)
2382 ~ Transmission serial number

1971

383 ~ January 18, 1971 (383rd day from Jan 1, 1970)
71 ~ 1971
CD ~ 402 (300hp)
7352 ~ Transmission serial number

463 ~ April 8, 1971 (463rd day from Jan 1, 1970)
71 ~ 1971
CD ~ 402 (300hp)
12894 ~ Transmission serial number

483 ~ April 28, 1971 (483rd day from Jan 1, 1970)
71 ~ 1971
CD ~ 402 (300hp)
13801 ~ Transmission serial number

218 ~ August 6, 1970 (218th day from Jan 1, 1970)
71 ~ 1971
CF ~ 454 (365hp)
1927 ~ Transmission serial number

379 ~ January 14, 1971 (379th day from Jan 1, 1970)
71 ~ 1971
CF ~ 454 (365hp)
5610 ~ Transmission serial number

1972

371 ~ January 6, 1972 (371st day from Jan 1, 1971)
72 ~ 1972
CD ~ 402 (240HP)
9305 ~ Transmission serial number

517 ~ June 1, 1972 (517th day from Jan 1, 1971)
72 ~ 1972
CD ~ 402 (240HP)
18002 ~ Transmission serial number

Courtesy Bill Hall
203 ~ July 22, 1971 (203rd day from Jan 1, 1971)
72 ~ 1972
CF ~ 454 (270HP)
1535 ~ Transmission serial number

309 ~ November 5, 1971 (309th day from Jan 1, 1971)
72 ~ 1972
CF ~ 454 (270HP)
2607 ~ Transmission serial number

Partial VIN

The partial VIN is stamped on the driver side of the transmission just above the pan rail. This identified the model year, assembly plant, last 6 digits of the car the transmission was installed in.

Location on driver side of case.

Partial VIN stamping on a Kansas City-built 1969 Chevelle TH400.

Partial VIN stamping on an Arlington-built 1970 Chevelle TH400.

Partial VIN stamping on an Atlanta-built 1970 Chevelle TH400.

Partial VIN stamping on a Los Angeles-built 1970 Chevelle TH400.

Partial VIN stamping on a Los Angeles-built 1970 Chevelle TH400.

Partial VIN stamping on a Los Angeles-built 1970 Chevelle TH400.

Partial VIN stamping on a Los Angeles-built 1971 Chevelle TH400.

Partial VIN stamping on an Oshawa-built 1971 Chevelle TH400.

Oil Pan

Early 1967 Chevelle TH400 oil pans had a unique heel mark, a bump, and 3 dimples.

According to a Chevrolet Service News Bulletin around July of 1967 saw a change in the TH400 oil pan; the heel mark, bump, and 1 of the dimples was gone.