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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 12-01-2015, 09:27 AM   #1 (permalink)
Buck N Di
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2004.5 LLY versus 2006 LBZ

I am currently driving an '04.5 LLY Silverado with 160,000 miles and have a chance to move up to an '06 Sierra LBZ with only 56,000 miles. My '04.5 averages 21 mpg on highway trips at speeds up to 70 mph. Would I see a significant drop in mpg in the '06 LBZ if I drive it the same way? Is the LBZ an upgrade over the LLY? Was there any upgrades from the early LBZ's to the later LBZ's that significantly affect performance? The LBZ that I have a chance to get was built in September 2006. Any advice or comments would be greatly appreciated.

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Old 12-01-2015, 10:41 AM   #2 (permalink)
Ramblinrodney
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I'm sure you know this all ready by searching with that build date your good on the LBZ Glow plug recall Subject: Product Emission-Engine Glow Plug System Concern-Reprogram Glow Plug Control Module #06522 - (03/24/2006) and New Head Gasket Part Numbers and Head Bolt Torque Specifications #06-06-01-006A - (05/16/2006)
I had an 05 and now an 07 witch is the same. You won't be getting as good of fuel mileage at least mine but the power differance and 6 speed and not having to listen to the engine roar is placeless.
Jump on it.
I'm sure this has been discussed many times. Search
Have you read this one? It might help alittle.
https://www.dieselplace.com/forum/63-...bz-engine.html

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Last edited by Ramblinrodney; 12-01-2015 at 11:05 AM.
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Old 12-01-2015, 12:31 PM   #3 (permalink)
Buck N Di
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Thank you for the quick reply and the info. Any other input would be greatly appreciated.
The '06 LBZ is in a Sierra 2500HD SLT with every option GM offered. They are asking $28,999.00 and I have been offered $15,900.00 for mine in trade.
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