A/T - Identification Nameplate and Information

Bulletin No. T 86-44
File in Group 7
Number 134
Corp. Ref. No. 806 7906
Date Mar. '86
SUBJECT: IDENTIFICATION INFORMATION FOR ALL THM TRANSMISSIONS, INCLUDING THE THREE LETTER MODEL CODE

MODELS AFFECTED: ALL 1986 CADILLAC MODELS

This information is intended to assist technicians in understanding the transmission identification nameplate (I.D.), its meaning, and where it is located on currently manufactured THM automatic transmissions.

The transmission identification tag or stamped identification contains such information as transmission type, model year, model, serial number, and Julian date.

TRANSMISSION IDENTIFICATION INFORMATION:

Refer to the following information and illustrations which will help explain all transmission identifications:

EXPLANATION OF ALL KEY TRANSMISSION IDENTIFICATIONS

MODEL YEAR: Tells what model year the transmission was built.

MODEL: Beginning with the start of 1986 production, all THM transmissions have a 3-letter model designator as opposed to the 2-letter model designator used in previous years. The third letter in each code group identifies the type transmission as follows:

TYPE OF THIRD LETTER OF
TRANSMISSION CODE GROUP
125C C
200-4R F
440-T4 H

JULIAN DATE: Tells what day of the year the transmission was built. It is also important to remember that the transmission model year starts MID-YEAR. This means the first transmission built in any model year will start with a high Julian date.

EXAMPLE: IF THE FIRST TRANSMISSION FOR THE MODEL YEAR 1986 WAS BUILT ON AUG. 5, 1985, THE JULIAN DATE WOULD START AT 217 AND GO TO 365 (DECEMBER 31). THE JULIAN DATE WILL THEN RETURN TO 001 (JANUARY 1) AND CONTINUE TO 216 (AUGUST 4, 1986).

SERIAL NUMBER: Tells what sequence the transmission was built.

SHIFT BUILT: Tells what shift the transmission was built.