Got a few questions.

First, what is LLY,LBZ? Seems like they are RPO codes but IM really not sure.

Seems like the better one is LBZ but why? Only difference I seen is more HP by 50 or so.

I’m looking at a 2007 1 ton and I know it’s a made in late 06, according to the vin but I really need to get all the info form that as well. I’m coming from a 2004 Dodge Cummins and trying to decide on what I should expect. I got 20 mpg in the Dodge and do not tow a lot, although I have thought about starting to do some Hot shotting when I have some free time just to do. Any info is greatly appreciated. I plan on keep the truck stock as well. Thanks Josh

LBZ ETC are the different engine generations. 06 are LBZs they have several differences(improvements...) in the block, turbo, ECM, and the Ally was converted to a 6speed. All 06 are LBZ some where called LLYs but they are still LBZ just detuned to the LLY power level. Mileage depends on how you drive at 70 my best avg. stock was 19-20.

LBZ press release (http://www.mrtruck.net/duramaxpress.htm)

Ok, I see.

Are there any real advantages going with a later 07. I know the one I’m looking at is an early o7 and has the cat eyes head lights and the newer ones have the big head lights.

In 2007 they produce the GMT-800 platform trucks also called classic body style till the end of 2006 and used the LBZ Duramax. Then in first of 2007 they changed to the GMT-900 platform trucks also called new body style NBS and used the LMM Duramax. It has additional emission device on it for the new emission requirements for 2007. Many of the other suburban, tahoe, avalanche and the GMC counterparts start NBS in first quarter 2007 releases to the GMT-900 platform.

As to NBS 2007.5 being better than Classic 2007 I say both the same. NBS has DPF which does lower MPG since it requires fuel to regenerate the DPF on the exhaust. Many post on DPF and how it works. Only big thing removing the DPF requires the ECM to be tuned. Now there are tuners that can disable the DPF but as you change the tune the ECM records a new caleribration number of the new tune. If you go in for say a slipping transmission they are gonna look at the history. See that there has only been so many regens plus the tune calibration list. It records the last 10 DIFFERENT tunes. They take a picture of this, send it to GM, GM see now stock ECM calibration, your now paying for a rebuild, and warranty is voided. That is the worst that can be modifying NBS Duramax. They even like to void on non stock tire sizes at some dealers.

Brian

Thats some good info.

On a side note, I was in Evensville seeing my brother in May.. Took the Vette up there, very nice place.

Yeah only been a few times during Apprenticeship schooling. Most time is in Bloomington towards home in Seymour. Yes it is nice. 20 years ago I was cruising before school and running through flashing yellow lights. I look up and this one was a working stop light and red when i went through. Still no traffic but a City cop pulled up beside me and then turned off to the left. I said I am out of here.

Brian