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99 GMC 2500 7.4 PICKUP

RACECAR

By RACECAR
in Ask A GM Technician

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RACECAR Enthusiast

RACECAR

Posted
Posted

Wonder if someone can help? I have a 1999 gmc pickup with a 454 came from Colorado it was a state truck very well maintaned vin 1GTGK24J2XFO18935 in the glove box is the tag with the RPO numbers at the top is the vin directly across is TK20903 THE UNDERNEATH ARE THE CODES which i no what most of them are is the TK20903 THE ENGINE NUMBER? i looked on the block and the number there is T1012XDH i no T is Tonawanda is this a replacement engine number? if so what is XDH 1012 is month and year? i asked my Chevy parts guy about a vin check he said he would only find warranty work done? THANKS VERY MUCH IF ANYONE REPLIES.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

I looked up your VIN on GM's database and it appears that's the original engine based on the XDH in the code on the engine. That's what the build information says the code of the engine is. A replacement engine wouldn't have that.

RACECAR Enthusiast

RACECAR

Posted
  • Author
Posted
I looked up your VIN on GM's database and it appears that's the original engine based on the XDH in the code on the engine.  That's what the build information says the code of the engine is.  A replacement engine wouldn't have that.

 

 

 

The engine pad just looks strange and it looked as tho the hood was off the truck unless it was rebuilt and decked and the number re stamped, anyway if it is T1012DXH we no T is Tonawanda DXH? 1012 month day year? should be a 98 or 99 block?

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

The engine identification number is located on the right front side of the engine block. The engine identification number gives specific information about the assembly of the engine. If reading the identification number from the left the following information can be obtained:

 

The first digit identifies the plant code.

The second and third digits give the month of the engine build.

The fourth and fifth digits describe the date of engine build.

The sixth, seventh, eighth digits give the engine broadcast code.

 

------------------------------------------------------------------------

 

The Vehicle Identification Number (VIN) Derivative is located on the left rear side of the engine block (2) and is a nine digit number stamped or laser etched onto the engine at the vehicle assembly plant. If reading the identification number from the left the following information can be obtained:

 

The first digit identifies the division.

The second digit identifies the model year.

The third digit identifies the assembly plant.

The fourth through ninth digits are the last six digits of the Vehicle Identification Number (VIN).

 

------------------------------------------------------------------------

 

Engine Verification Label

 

The engine verification label is placed in two locations on the right side of the engine.

 

On the back of the valve rocker arm cover

On the side of the oil pan

 

The engine verification label displays the bar code and the broadcast code that identifies the engine RPO, transmission RPO and other component RPOs that the engine includes and excludes.

RACECAR Enthusiast

RACECAR

Posted
  • Author
Posted
The engine identification number is located on the right front side of the engine block. The engine identification number gives specific information about the assembly of the engine. If reading the identification number from the left the following information can be obtained:

 

The first digit identifies the plant code.

The second and third digits give the month of the engine build.

The fourth and fifth digits describe the date of engine build.

The sixth, seventh, eighth digits give the engine broadcast code.

 

------------------------------------------------------------------------

 

The Vehicle Identification Number (VIN) Derivative is located on the left rear side of the engine block (2) and is a nine digit number stamped or laser etched onto the engine at the vehicle assembly plant. If reading the identification number from the left the following information can be obtained:

 

The first digit identifies the division.

The second digit identifies the model year.

The third digit identifies the assembly plant.

The fourth through ninth digits are the last six digits of the Vehicle Identification Number (VIN).

 

------------------------------------------------------------------------

 

Engine Verification Label

 

The engine verification label is placed in two locations on the right side of the engine.

 

On the back of the valve rocker arm cover

On the side of the oil pan

 

The engine verification label displays the bar code and the broadcast code that identifies the engine RPO, transmission RPO and other component RPOs that the engine includes and excludes.

 

 

 

Thanks alot for taking the time to post this info.

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