8-Lug Truck Performance Duramax, 8.1L, and HD tech | Intakes | Exhaust | Tuning | Suspension | Drivetrain

Differences in LB7, LBZ, LLY, & LMM

Old Mar 15, 2009 | 10:29 PM
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http://en.wikipedia.org/wiki/Duramax_V8_engine

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Old Mar 15, 2009 | 10:41 PM
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Originally Posted by stock48
I have owned LB7, LLY, and LBZ. The LBZ was by far the most powerful, and my favorate. The LLY was the most gutless, and least favorate. The LB7 is right in the middle. I keep it around because it's paid for, and gets great milage.


LB7
The LB7's are knowen to get the best MPG out of all the Dmaxes. Main thing to worry about is the injectors they Will go bad at some point in time. They have a 200K mile/ 7Yr warrante but after that it is on you. Expect $4500.00 at the dealer. The fuel psi regulators tend to get sticky and cause a surging idle.

LLY
Bigest problem is they can tend to over heat when pushed to there max. Other than that they have minor problems like injector harness rub through, egr valve, and VVT can stick. LLy other than the heat issue, being gutless stock, and guzziling fuel they are fairly problem free.

LBZ
leaps and bounds ahead of the LLY, and LLY in performance stock form and with mild modds. Has a six speed Xmission that will take more power than the other two. LBZ has less lag, and runs smoother than LB7, and LLY's. Biggest problem with the LBZ is when getting into the bigger HP tunes they have been knowen to crack pistons, and have leaky Xmission cooler lines.

LMM
I don't know much about them but like said above very similar to the LBZ. Same long block, and Xmission, just a different turbo, DPF, and emissions. I have heard the LMM is king when DPF is removed. The LMM turbo is said to flow more air.
Sweet, thanks for sharing your experiences.

Originally Posted by kbracing96
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Old Mar 15, 2009 | 10:58 PM
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Ok the lady friend is gone so I have some time to type.

Best bang for the buck out there IMO is to do what I did, find a high mileage LBZ and take the money saved and dump it into mods. I found mine with 73K and a little haggling for 26K OTD. Mines loaded with every option except DVD and sunroof. I wouldnt look at anything older then 06, 06 was the first year for the 6 speed which is just a 5 speed with an added OD with a .61 ratio for better unloaded cruising mileage. LMMs suck with all the emissions stuff and with you being in Cali of course you can take all the DPF/Cat stuff of but youll have to put it back on for SMOG. With an LBZ all it would be is a front pipe swap(~45min) and quick EFI flash and youll pass.

Mike L in LA can hook you up with a SCIV for about 5K installed, and he also has aftermarket trans cooler lines so you dont have the leaky line problem.

Just be careful, you think a gas motor'd truck is addictive wait til you get a diesel. Its rediculously easy to make power and still be totally driveable. After I get back from AIT school Ill be paying off the truck then the fun begins, mid 12s on 35s sounds pretty good
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Old Mar 16, 2009 | 10:19 AM
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Thanks Cody, I've been reading a lot on the Diesel Place and that is exactly what I got out of it all. So an '06 or '07 Classic LBZ CCSB is what I'll be looking for. Has to be 4wd for when I get out and go back home.
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Old Mar 16, 2009 | 01:33 PM
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I would definitely recommend the suncoast tranny. I had a 2006 ECSB LBZ. It had a 6" lift and 35x13.50 tires and I ran a best of 13.4 with intake, exhaust, tuning, lift pumps, and a suncoast IV.
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Old Mar 16, 2009 | 01:38 PM
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This was sureshot's truck.
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Old Mar 17, 2009 | 03:32 AM
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Also for an important note a 2006 LLY is the same as a LBZ It is just tuned to 310HP from the factory. All it needs is programming to be a LBZ.
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Old Mar 17, 2009 | 03:50 AM
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Originally Posted by sharpshooter
This was sureshot's truck.
Very nice! I like the black looks like a fabtech. Here is my old 05 LLY with a 6'' Fabtech and the 305's. I later went to 20x35's but have no pics.





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Old Mar 17, 2009 | 11:00 PM
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Mine
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Old Mar 19, 2009 | 11:02 PM
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Sureshot and Cody, your guys' trucks are sweet! I'm all about either of those two rigs Preferably a CCSB.
Stock48, that was a 6" lift? Looks huge! Nice rig!
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