Turbo Hydra-Matic 400 Decoding

Code/Engine	HP/Vehicle
CA - 350,396,400,402	(145,160,170,240,255,265hp)  2bbl, Chevrolet, Monte Carlo
CB - 400,427,454	(180,345,390hp) Chevrolet
CC - 396	(325,350hp) Chevelle, Camaro
CD - 327,350,400,402,454	(215,235,240,250,300hp) Chevrolet, Chevelle, Monte Carlo
CE - 396	(350hp) Chevelle, Camaro, Nova
CF - 402,427,454	(215,235,270,335,350hp) Chevrolet, Chevelle, Monte Carlo
CG - 396,454	(265,365,390hp) Chevrolet, police
CH - 427	(390hp) Chevrolet
CJ - 396,402	(???,240hp) Chevy Truck 10,20,30 series
CK - 350	(165,190,195,200,300hp) Corvette
CL - 427	(400hp) Corvette
CP - ???	(???hp) Chevy Truck C-30 series
CQ - 427	(335hp) Chevrolet
CR - 400,402,454	(170,215,235,240,270,360,390hp) Chevrolet, Monte Carlo, Chevelle, police
CS - 454	(245,270,360,365hp) Corvette, Chevelle, Monte Carlo
CT - xxx	(???hp) Chevy Truck C10 & C20 series
CW - 402	(375hp)...Chevelle, Camaro, Nova
CX - 396,427	(375,425,430,435hp) COPO
CY - 350,396,427,454     (high shift point)	(245,375,425,430,435,450hp) Chevrolet, Corvette, Chevelle, Camaro, Nova.
CZ - 350	(205,250,255hp) Corvette

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

TH400 gear ratios are 2.48:1 for 1st gear, 1.48:1 for 2nd gear and 1.00:1 in 3rd gear.

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.

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

68 ~ 1968
CC ~ 396/350 HP
282 ~ October 9, 1967 (282nd day from Jan 1, 1967)
5813 ~ Transmission serial number

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

69 ~ 1969
CE ~ 396/325 HP
205 ~ July 23, 1968 (205th day from January 1, 1968 - leap year)
1071 ~ Transmission serial number

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

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

70 ~ 1970
CF ~ 402,427,454/215,235,270,335,350hp
304 ~ October 31, 1969 (304th day from Jan 1, 1969)
8569 ~ Transmission serial number

70 ~ 1970
CY ~ 350,396,402,454 (high shift point)
281 ~ October 8, 1969 (281st day from Jan 1, 1969)
2683 ~ Transmission serial number

70 ~ 1970
CY ~ 350,396,402,454 (high shift point)
413 ~ February 17, 1970 (413th day from Jan 1, 1969)
1928 ~ Transmission serial number

Courtesy Bill Hall
72 ~ 1972
CF ~ Chevrolet, Chevelle, Monte Carlo
203 ~ July 22, 1971 (203rd day from Jan 1, 1971)
1535 ~ Transmission serial number

Partial VIN

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

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