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Discussion Starter · #1 ·
I'm just wondering how to tell if I've got a LBZ or LYY engine. Mine was built in Nov/06. Which number of the VIN should I look at?

On another note...I've had my truck 2 days and it has about 70 miles on it and already I've got tranny fluid on the driveway. Think it's the converter seal. Not a great sign...but I still love the truck!
 

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the 8th didgit in the vin starting from the beginning if it is a 1=LB7 01 thru 04,2=LLY,04.5 thru 05,3=LLY,06,D=LBZ,06,sorry to hear the trouble,but i have had 2 duramaxs and i love the diesel and they do a great job for me
 

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Mine is an 06 with a 2 for the 8th didgit. How is that tyreboyz?
 

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another thing to do,check the year of the truck using the vin #,if you count the 10th didgit in from right to left or the 8th didgit from the left to right if it is ? it will be a ?..
8=08
7=07
6=06
5=05
4=04
3=03
2=02
1=01
y=00
let me know what you find out..
 

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Yep its a 6= 2006 still with a 2 for the engine type I don't think they ever had an engine designater = 3. only 1,2,and D
 

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i just checked my 06 gmc LBZ and it has a D for the 8th didgit..not sure what the problem is..
 

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Up top you were saying that an 06 LLY has a 3 for the 8th didgit in the vin but my 06 LLY is a 2 I don't think they ever made an engine with a 3
 

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i had my wires crossed a little,sorry for the wrong info but you are right the 06 LLY is a 2 same as the 04.5 and 05 LLY but they are different computers from the 05 LLY to the 06 LLY..
 
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