Duramax Diesels Forum Truck of the Week
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Old 05-21-2011, 07:24 PM
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Default LB7=LMM Swap

I have been looking for a good lbz with trans and electronics to swap into an 04 lb7. I found a good deal on a wrecked lmm, and was just curious how much different the lmm is and if it would be possible to swap it in.
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Old 05-22-2011, 01:54 AM
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Have to swap to the LBZ injectors, ECM & TCM, the egr intake to get rid of the butterfly valve, reprogram the GPCM, MAYBE a LBZ engine harness (I'm un-sure of that, as I don't have a LMM wiring diagram on me atm.). Off the top of my head that's about it, but I haven't done much research into it. -- Just to give you a general idea.
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Old 05-22-2011, 05:17 AM
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he knows what he talking about!!! ^^^ he helped me through mine
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Old 05-22-2011, 05:41 AM
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skip the swap hassle and give it to me to put in my 6.0 gasser..
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Old 05-22-2011, 08:11 PM
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Ok thanks guys. So in other words if it is cheap enough it would be worth the hassel
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FASS 150, MBRP downpipe, Diamond Eye Exhaust.
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Old 05-22-2011, 08:16 PM
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Yep, all depends what your time is worth in dollar value to you. Be prepared to be out of the money for a bit though. You're going to as least eat the injectors and computers for a few weeks. Not sure on the demand of stock LMM injectors but it could be awhile before you sale them.
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Old 05-22-2011, 08:23 PM
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I wouldn't worry about converting the LMM to an LBZ; just bolt it in as is. Put in a DPF delete tune and call it done.
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Old 05-22-2011, 09:53 PM
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x2, since it is going into an '02, the electrics won't plug-n-play in either case, might as well save some trouble and keep it an LMM.
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Old 05-22-2011, 11:38 PM
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Quote:
Originally Posted by DAVe3283 View Post
x2, since it is going into an '02, the electrics won't plug-n-play in either case, might as well save some trouble and keep it an LMM.
Yes, that would clearly be the case if he was putting it in a 02. However, he earlier stated it's going into a 04. Offering poor advice because you didn't read his question, isn't going to help anything but make it more difficult for those who know what the hell is going to to explain it.
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Old 05-22-2011, 11:48 PM
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Quote:
Originally Posted by JoshH View Post
I wouldn't worry about converting the LMM to an LBZ; just bolt it in as is. Put in a DPF delete tune and call it done.
Not that simple. For starters LMM and LBZ communication protocols are different. LMM ECM actually talks to the truck though high speed. Where as the LBZ ECM & TCM is programmed by high speed and talk to each other in it, but they talk to the rest of the truck low speed. Same reason it's really complicated to put a LLY or LBZ in a 02 and older vehicle. In this case however, the engines (LBZ and LMM) are almost mechanically identical for the most part and can be converted to one another. Now if a LMM TCM and ECM can be programmed to be back to the older O.S. I belief so. However, I don't think it is as simple as EFI live to do this. Last I knew it took bench programming, which is a lot more than the average home user has.
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Old 05-23-2011, 06:28 AM
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Can you explain why he has to convert it to an LBZ to make it work? Is it just so the computers acan talk to the other computers in the truck?

The injectors shouldn't need to be swapped out BTW. LBZ and LMM injectors are interchangeable. Meaning an LBZ can run on LMM injectors and vice versa.
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Old 05-23-2011, 07:01 AM
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Quote:
Originally Posted by chrisuns View Post
Yes, that would clearly be the case if he was putting it in a 02. However, he earlier stated it's going into a 04. Offering poor advice because you didn't read his question, isn't going to help anything but make it more difficult for those who know what the hell is going to to explain it.
My bad, he did say an 04. I somehow missed that in his post, and saw an 02 in his signature. No need to get snippy though...
Quote:
Originally Posted by Drholliday View Post
Can you explain why he has to convert it to an LBZ to make it work? Is it just so the computers acan talk to the other computers in the truck?

The injectors shouldn't need to be swapped out BTW. LBZ and LMM injectors are interchangeable. Meaning an LBZ can run on LMM injectors and vice versa.
chrisuns is actually right when he says it is how the computers "talk" to the truck. The protocols that the LMM uses to talk to the rest of the truck are different than what the 04-06 trucks use, so if you put the LMM in the older truck it won't be able to communicate. If the computers don't talk to the rest of the truck, thinks like the security system won't work right, and presumably the OP wants the truck to work like factory.
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Old 05-23-2011, 08:51 AM
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Quote:
Originally Posted by Drholliday View Post
Can you explain why he has to convert it to an LBZ to make it work? Is it just so the computers can talk to the other computers in the truck?

The injectors shouldn't need to be swapped out BTW. LBZ and LMM injectors are interchangeable. Meaning an LBZ can run on LMM injectors and vice versa.
The same reason I mentioned above. -- Those O.S. speak two different languages. Can't leave an open loop in the system either otherwise it will throw codes. The injectors have to be swapped, they're flow matched then programmed into the ECM and GPCM. -- LBZ 6 hole IIRC and LMM are 7 hole, it'll screw the whole injection chart if you interchange these. They know how many holes each injectors has, flow charts ect ect...
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Old 05-23-2011, 09:14 AM
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With some one who already has EFI live the injection tables in the tunes probably won't be staying stock for long. I'm just saying they will work with an LBZ ECM. Its backwards too, LMM's have one less whole then the LBZ. It really doesn't matter if on flows a touch more then the other (between LMM and LBZ)... If it would matter guys who put bigger injectors in their trucks would be screwed.
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