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Chevrolet Turbo Hydra-Matic 400

 

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The Turbo Hydra-Mastic 400 (TH400) three-speed transmission was developed by GM and first found its way into Chevrolets in 1965. First introduced in 1964 under the name "Turbo Hydra-Matic" in Cadillacs and "Super Turbine" in Buicks in 1964. The TH400 saw its first use in Chevelles as an option with the SS 396 series sport coupes and convertibles but was also optional on 1967 El Caminos with any one of the three 396-cid engines in 1967. The TH400 continued to be one of two optional automatic transmissions in the SS 396 series Chevelles until the 1969 model year when the Powerglide was dropped with the 396 engine with the SS 396 option (RPO Z25). The Powerglide continued to be used until 1973, just not with the SS 396 or SS 454 engines. Various TH400 transmissions were used dependent on the particular 396/454 engine they were used with. When you ordered a 1979-1972 Chevelle with a 'big-block' engine, the appropriate TH400 was automatically selected at the assembly plant and installed.

 

Interesting that no Chevelle with a 'small-block' engine was ever offered with the TH400 but the TH400 was used with 'small-block' Corvettes and full-size Chevrolets beginning in 1968.

 

Only those documented via build sheets or other paperwork is listed here and other models of Chevrolets may use the same transmission tag codes. The TH400 was only available when a 396/402/454 engine was ordered. The 2-speed Powerglide was still an available automatic transmission option in 1967 and 1968 but was dropped for the 1969 model year behind 396/402/454 engines. There may be others but they haven't surfaced to date.

 

Some Chevrolet applications are shown here with the tag code, engine, and Chevrolet model.

 

Tag Code Engine Size Application
CA 350,396,400,402 145,160,170,240,255,265hp - 2bbl, Chevrolet, Monte Carlo
CB 350,400,427,454 180,210,345,390hp - Chevrolet, Corvette
CC 396 325hp - Chevelle, Camaro
CD 327,350,400,402,454. 215,235,240,250hp - 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 n/a 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 n/a Chevy Truck C10 & C20 series
CW 402 375hp - Chevelle, Camaro, Nova
CX 396,427 375,425,430,435hp - COPO
CY 350,396,427,454 245,375,425,430,435,450hp - Chevrolet, Corvette, Chevelle, Camaro, Nova (high shift point)
CZ 350 205,250,255hp) - Corvette

 


 

Chevelle Examples

 

1967

 

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521 ~ June 5, 1967 (521 days from January 1, 1966)
CC - 396 325hp
67 ~ 1967 model year
15486 ~ Transmission serial number


 

1968

 

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


 

1969

 

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

 

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


 

1970

 

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

 

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300 ~ October 27, 1969 (300th day from Jan 1, 1969)
70 ~ 1970
CS ~ 454 (360hp)
x244 ~ Transmission serial number

 

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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


 

1971

 

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

 

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


 

1972

 

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

 

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

 


 

Corvette Examples

1970

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545 ~ June 29, 1970 (545th day from Jan 1, 1969)
70 ~ 1970
CK ~ 350 (300hp)
4163 ~ Transmission serial number


 

1977

 

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378 ~January 12, 1977 (378th day from Jan 1, 1976)
77 ~ 1977
CB ~ 350 (200hp)
1905 ~ Transmission serial number

 

 


Partial Vehicle Identification Number Location

 

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Driver side of case just above oil pan rail

 


Transmission oil pan

 

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

 

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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.

 


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