For 1990-2009 cars

# Info - Automatic Transmission Serial Number and Site Code Locations

Subject: | Automatic Transmission Serial Number and Site Code Locations

Models: | 2003 and Prior Passenger Cars and Trucks

| with North American Automatic Transmissions

General Motors automatic transmissions fall into two categories: those manufactured "by GM" (OEM) and those manufactured "for GM" (REMAN). Only OEM transmissions are used in the production of new GM vehicles. Goodwrench® service transmissions can be either OEM or REMAN. All Goodwrench® REMAN transmissions are identified by a green metal tag with the words "Manufactured for GM" except for Allison®, 4L30E (Catera) and 5L40E (CTS).

• | OEM = blue or black tag = "by GM"

• | REMAN = green tag = "for GM" (except for Allison®, Catera and CTS)

### Remanufactured Transmission Serial and Site Code Number Locations

Other than the exceptions shown above, all North American Remanufactured transmissions use the same green tag shown below.

Important: When reporting serial and site code numbers, use the top row of characters followed by the bottom row with no spaces between any of these characters. Refer to the example below.

The Allison®-built transmissions, as well as the 4L30E (Catera) and 5L40 (CTS) do not have green REMAN tags. Refer to the appropriate section in this bulletin for each of these transmissions' correct OEM and REMAN serial numbers.

#### Goodwrench® Transmission Label (green background)

Serial number: 17DPH600103298206

Require all numbers without spaces

### OEM Transmission Serial and Site Code Number Locations

#### Front Wheel Drive Transmissions

The transmission ID tag is usually located on the side of the case facing the rear of the vehicle.

#### 3T40 (OEM) MD9

(1) | Tag Location
(2) | Serial Number

#### 4T40E/4T45E (OEM) MN4/MN5

(1) | Tag Location
(2) | Site Plant
(3) | Serial Number

#### 4T60E (OEM) M13

(1) | Tag Location
(2) | Site Plant
(3) | Serial Number

#### 4T65E (OEM) M15/MN3/MN7

(1) | Tag Location
(2) | Site Plant
(3) | Serial Number

#### 4T80E (OEM) MH1

(1) | Tag Location
(2) | Site Plant
(3) | Serial Number

#### Rear Wheel Drive Transmissions

#### 4L30E (OEM) ML4 (Cadillac Catera 97-01)

(1) | Serial Number
(2) | Tag Location

#### 5L40E (OEM) M82 (Cadillac CTS)

(1) | OEM
(2) | Remanufactured
(3) | Part Number
(4) | Serial Number
(5) | Tag Location

#### 4L60E (OEM) M30

(1) | Location
(2) | Serial Number
(3) | Optional Transmission Identification Location
(4) | Transmission Identification Location

(No ID tag on transmission; serial number is stamped on case)

#### 4L80E/4L85E (OEM) MT1/MN8

(1) | Tag Location

#### Allison® 1000 Series (OEM) M74

The Allison® LCT 1000 automatic transmission ID tag (1) is located on the right (passenger side), just rear of the PTO (power take off) cover.

Use the model number (1), the date of manufacture number (2) and the serial number (3) for reporting purposes.

For example: 1000XXXXXYYYYYYYYYY (1000 + 5 characters + 10 characters).

(1) | Model (Series)
(2) | Date of Manufacture
(3) | Serial Number