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Discussion Starter #1
Please don't jump down my throat about this question. But, this is my second 6.6 dmax in 6 mo. and I am looking to do some mods, and I need to know how I determine if its a lly or lbz. It's 03 chevy 3500. Please be kind. Thanks.
 

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neither you have a lb7
 

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it is a lb7 because it is an 03 model the lbz didnt come out untill 06!
 

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if its a 2003 its a LB7 you can tell by the 8th vin digit LB7 is a #1 and the LLY is a #2
 

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8th vin digit
1= LB7
2= LLY
D= LBZ
6= LMM
 

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Discussion Starter #6
Wow. Thanks for the quick answers. So, is it still a good engine? It's got only 110k and also is it a 4 or 5 speed allison?
 

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It should be the 5 speed
 

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5 speed and i believe injector issues on some
 
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