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To confirm which engine/generation Duramax check the 8th digit in the VIN number
Here's the Duramax Generations:
1st Gen 2001 - Early 2004 LB7
2nd Gen 2004.5 - 2005 LLY
3rd Gen 2006 - 2007 LLY/LBZ
4th Gen 2007.5 2010 LMM
5th Gen 2011 - Present LML
- If it's a 1 you have the LB7 motor
- If it's a 2 you have the LLY motor
- If it's a D you have the LBZ motor
Here's the Duramax Generations:
1st Gen 2001 - Early 2004 LB7
2nd Gen 2004.5 - 2005 LLY
3rd Gen 2006 - 2007 LLY/LBZ
4th Gen 2007.5 2010 LMM
5th Gen 2011 - Present LML