A/T - Identification Information

Number: 84-191

Section: 7A (VIIc)

Date: Sept., 1984
Subject: AUTOMATIC TRANSMISSION IDENTIFICATION INFORMATION

Model and Year: ALL THM TRANSMISSIONS
TO: ALL CHEVROLET DEALERS

This information is to assist the technicians in the field in properly identifying the transmission identification (I.D.), its meaning, and where it is located on the transmission. Therefore, this bulletin will explain those items for currently manufactured THM automatic transmissions.

The transmission identification tag or stamped identification identifies such information as the transmission type, model year, model, serial number, Julian date, etc.

NOTICE: Anytime assistance is needed concerning a transmission condition, the technician must have the following information: the transmission type, model year, serial number, Julian date, etc., at the time the inquiry is made.

Refer to the following information and illustration which will explain all transmission identifications.

EXPLANATION OF ALL KEY TRANSMISSION IDENTIFICATIONS

Model Year : Tells what model year the transmission was built.

Model : Transmission model identification.
Julian Date : Tells what day of the year the transmission was was built. It is also very 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 higher Julian date.

EXAMPLE: IF THE FIRST TRANSMISSION IN 1984 WAS BUILT ON AUGUST 5TH THEN THE JULIAN DATE STARTS AT 218 AND GOES TO 365 (DECEMBER 31). THE JULIAN DATE WILL THEN DROP TO 001 JANUARY 1, AND THEN CONTINUE TO 217 (AUGUST 4, 1985).

Serial Number: Tells what sequence the transmission was built.

Shift Built : Tells what shift the transmission was built.

THM 125/125-C TRANSMISSION I.D. NAMEPLATE LOCATION:

THM 125/125-C TRANSMISSION I.D. NAMEPLATE YPSILANTI, MICHIGAN:

THM 125/125-C TRANSMISSION I.D. NAMEPLATE WINDSOR, CANADA:

THM 125/125C

The THM 125/125C transmission is built at Ypsilanti, Michigan and Windsor, Canada. Transmissions built at Ypsilanti, Michigan use serial numbers; and beginning 1985 model year, Julian dates have been added to the nameplate. Transmissions built at Windsor, Canada use Julian dates. However, the transmission identification tag location is the same.