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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ, LMM & LML engine specific topics.

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Old 07-13-2017, 01:57 PM
Wiledcoyote Wiledcoyote is offline
Join Date: Jul 2017
Location: US,ca
Posts: 1
Question Putting a 05 lly into my 06 lbz k3500 what has to be changed?

My 06 k3500 had 0 compression on #4 cyl and 150lbs #6 the rest where 350+ truck had 200,000 miles
So bought a used 2005 lly motor .
What do I need to change to make it work?
Anything I should do before I swap getting ready to pull the lbz out ,
Thanks for your help
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Old 07-17-2017, 11:34 AM
More Power's Avatar
More Power More Power is offline
Join Date: Feb 2000
Location: Big Sky Country
Posts: 10,267

The fuel injection systems are different, if I remember correctly, so you'll need the complete '06 fuel injection system transferred to the '05. Or... convert the truck's existing '06 system to an LLY.
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Old 07-20-2017, 06:47 AM
Kennedy Kennedy is offline
Long Distance Crew Chief for BMDMAX
Join Date: Mar 2000
Location: Loyal WI US
Posts: 10,591

It can be done, but the question is why? The LBZ is one of the more sought after powertrains. due to advanced fuel and ECM without the emissions of the LMM.

LLY=Delphi electronics with injectors driven via remote FICM
LBZ= Bosch electronics with injectors driven directly from the ECM

If you do the LLY you will either need to run the full LLY electronics or at a minimum swap out the reluctor wheel as the LB7/LLY had a different tooth count than the LBZ/LMM.
Kennedy Diesel-owner
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