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AUTOMATIC TRANSMISSION IDENTIFICATION
 

BUICK
 

Twin Turbine

1
1962
Code Prefix
1963
Code Prefix
ALL B 031 ALL H 031
 

Super Turbine 400 & GM Tubro Hydra-Matic / 375/ 400

2
1964
1965
LeSabre V8-300 BU LeSabre V8-300 BU
V8-401
Column shift
 BJ V8-401
3.07 Axle
 BJ
V8-401
Console shift
 BK V8-401
3.23 Axle
 BR
V8-425
Column shift
 BL V8-425
3.07 Axle
 BN
V8-425
Console shift
 BN V8-425
3.23 Axle
 BT
V8-425
2 Carbs, Column shift
 BP V8-425
2 Carbs, 3.07 Axle
 BQ
V8-425
2 Carbs, Console shift
 BQ V8-425
2 Carbs, 3.42 Axle
 BS
1966
1967
V8-340
Sport wagon 400
 BW V8-340
LeSabre 400
 BU
V8-340
LeSabre
 BU V8-400
G.S. 400
 BA
V8-400
G.S. 400
 BA V8-430
1
 BT
V8-401 BR V8-430
Sport wagon 400
 BW
V8-425
3
 BS
1969
V8-425 BT V8-350
LeSabre
 BU
V8-430 BT V8-400
Sport wagon 400
 BW
1968
 V8-400
G.S. 400
 BA, BB
V8-350
LeSabre
 BU V8-430
Wildcat, Electra
 BC
V8-400
G.S. 400
 BA V8-430
Riviera
 BT
V8-400
Sport wagon 400
 BW
1971
V8-430
Wildcat, Electra, Riviera
 BT V8-455
G.S. 455
 BS
1970
 V8-455
G.S. 455 Stage I
 BB, OW
V8-455
G.S. 455
 BA V8-455
Riviera
 BT
V8-455
G.S. 455 Stage I
 BB V8-455
all others
 BC
V8-455
Riviera
 BT
1973-74
V8-455
all others
 BC V8-455
Century, Regal less Stage I
 BS
1972
 V8-455
Century, Regal Stage I
 BB
V8-455
G.S. 455
 BS All others
Hi Perf.
 BT
V8-455
G.S. 455 Stage I
 BB All others
Exc. Hi Perf.
 BC
V8-455
Centurion Hi Perf.
 BU    
V8-455
Riviera,G.S. Perf. axles
 BT    
V8-455
all others
 BC    

Special Dual Path Drive

4, ID consists of a letter followed by one or more digits.

Super Turbine 300

5
1964
1965
V6-225 25 V6-225 LJ
V8-300
Exc. Sportwagon
 35 V8-300
Exc. Sportwagon
 MJ
V8-300
Sportwagon
 36 V8-300
Sportwagon
 MR
1966-67
 V8-400
Skylark Gran Sport
 NK
V6-225 LJ
1968-69
V8-300
Exc. Sportwagon
 MJ All 6-250 LC
V8-340
Sportwagon
 MR All Sportwagons MH
V8-340
Exc. Sportwagon
 ML All V8-350
Exc.Sportwagons
 ME
V8-400
Skylark Gran Sport
 NK  

Tubro Hydra-Matic 350

6
1969
1970
Exc. Sportwagon JH 6-250 JE
Sportwagon JJ 8-350
2 Bar Carb. Exc. Lesabre
 JH
  8-350
4 Bar Carb. Exc. Lesabre
 JR
  8-350
2 Bar Carb. Lesabre
 JJ
  8-350
4 Bar Carb. Lesabre
 JS
     
     

1- Stamped on lower edge of reaction shaft flange

2- Stamped on Id plate with year, serial #

3-Wildcat, Riviera, G.S.

4- Stamped on raised surface of case, forward of oil pan left side

5- 1964-65 Metal tag

1965-67 Stamp on servo cover

6-Production day, shift built, transmission model and model year are stamped on the 1-2 accumulator cover in the middle right side of case
 
 
The transmission code decoder reveals the transmission type, engine displacement, plate location and configuration.