Transmission Identification Information

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Transmission Identification Information (Toledo or Romulus Build)

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
1	4 = 2004
2	Model
3	Hydra-Matic 4L60-E
4	Julian Date or Day of the Year
5	Shift Built, See Shift Build Chart
6	Serial Number
7	Case/Pan Frame Rail Location
7	Case/Pan Frame Rail Location
8	Optional Transmission ID Location, Tag Is Used as a Back-Up If Unable To Etch Case/Pan Area and To Bar Code Scan

Fig 2: Transmission Identification Information (Ramos Arizpe, Mexico)

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
1	4 = 2004
2	Model
3	Hydra-Matic 4L60-E
4	Plant of Manufacture, 4 is Ramos
5	Julian Date or Day of the Year
6	Shift Built, See Shift Build Chart
7	Transmission Serial Number
8	Optional Transmission ID Tag Location, Tag Is Used as a Back-Up If Unable To Etch Case/Pan Area and To Bar Code Scan
9	Case/Pan Frame Rail Area
9	Case/Pan Frame Rail Area

Fig 3: Transmission Identification Information (Bar Code Label Contents)

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
1	4 = 2004
2	Model
3	Hydra-Matic 4L60-E
4	Transmission Asm. as Shipped Number
5	4 = Model Year
6	Julian Date or Day of the Year
7	Letter After Julian Date Identifies the Plant Shift Build, See Shift Build Chart
8	Bar Code
9	Serial Number
10	Broadcast Code
11	Transmission ID
12	Build Location Y = Toledo, OH, R = Romulus, MI, 4 = Ramos Arizpe, Mexico

Plant and Shift Build Chart

Plant	Build Line	1st Shift	2nd Shift	3rd Shift
Toledo, OH	ML1	J	W	X
	ML2	A	C	Not Used
	ML3	B	H	Not Used
	ML4	S	L	V
	ML5	K	E	Z
Romulus, MI	1	A	-	B
Ramos Arizpe, Mexico	1	A	-	-