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Hello, I just bout a 2004 2500HD Duramax and am really happy with it. I had a 2500HD gasser (12 MPG). My question to you is.... How do I tell which mengine I have? I have no idea if it is an 04 0r 04.5 LLY, LB7, I am clueless, please help.


Thanks for your time.
 

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Look at the 8th digit of the VIN. If 1=LB7, 2=LLY. Welcome to the forum...you will enjoy your truck.
 
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