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Duramax Second Generation: 2004.5-2005 (LLY) Discuss the second generation (2004.5-2005 LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion belongs in Third Generation forum due to the differences of the 2006 LLY and the 2004.5-2005 LLY. Engine related discussion ONLY.

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Old 10-09-2015, 08:08 AM   #1 (permalink)
HOOGENRAAD
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2005 lly vs 2006 lly?

Have a question, already searched here. I have a 2005 lly and looking to replace the engine. I found a 2006 lly but the egr system looks totally different. Are the cylinder heads the same between the 2 years? What will have to be changed for me to make this work? Thanks guys!

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Old 10-09-2015, 10:05 AM   #2 (permalink)
DRCook
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a 2006 LLY is actually a detuned LBZ. whether or not any of the metal pieces are interchangeable I cannot say, but the electronics are different
as are a lot of the overall design, such as compression ratio, different pistons, etc.

The 04.5/05 LLY has a 16 bit computer, the 06 LLY has the LBZ's 32 bit computer. IIRC the injectors run on different voltages.

this is why there is why the 06 LLY is included in the LBZ forum right above the LLY forum here on DP

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Last edited by DRCook; 10-09-2015 at 10:07 AM.
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Old 10-09-2015, 12:57 PM   #3 (permalink)
1953drtelco
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Quote:
Originally Posted by HOOGENRAAD View Post
Have a question, already searched here. I have a 2005 lly and looking to replace the engine. I found a 2006 lly but the egr system looks totally different. Are the cylinder heads the same between the 2 years? What will have to be changed for me to make this work? Thanks guys!
Just curious on how many miles on your truck before you need an new engine?
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Old 10-11-2015, 05:16 PM   #4 (permalink)
frankenstien
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someone will correct me if i am wrong, but i believe you can use the bottom end of the newer lly/lbz motor, just not the heads due to different injectors and electrical stuff. if you need heads, you will need heads from the 04.5-05lly
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HG's at 100,500 miles, studs and grade C's, as of 1/13/15 120k miles

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Old 10-17-2015, 08:05 AM   #5 (permalink)
johnjr
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Hey Frankenstein where did you get those diesel exempt stickers? We don't have diesel inspection in NJ, and the cops stop you for no inspection sticker. If we had them it would save the cops and us some inconvenience, sorry for the hijack.
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Old 10-17-2015, 01:57 PM   #6 (permalink)
frankenstien
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Originally Posted by johnjr View Post
Hey Frankenstein where did you get those diesel exempt stickers? We don't have diesel inspection in NJ, and the cops stop you for no inspection sticker. If we had them it would save the cops and us some inconvenience, sorry for the hijack.
Those were issued by the state of Alaska when the IM/smog program was still in effect, but it has since gone away, fortunately. Its just leftover on my windshield.
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2005 GMC 2500HD SLT LLY PCV reroute 5'' MBRP TB Straight Pipe, LBZ MP, Edge Insight CTS, All Season Diesel SS Tie Rod Sleeves,ProFab DP, EFI Live V2 DSP5 tuning by Danville, Merchant Auto Transfer case brace, S&B CAI, fass 150 adjustable lift pump,

HG's at 100,500 miles, studs and grade C's, as of 1/13/15 120k miles

1974 GMC Sierra Grande 383/TH350/205/D44/14FF
2016 F150 Roush NON-SC (wife's rig)
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