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Modiesel,
Becasue your truck is equipped with the LBZ engine, I suspect you actually have a 2007 "Silverado Classic" 2500HD Duramax. These trucks were all built in the 2006 calendar year and sold as 07 models. The LBZ engine is designed to run either LSD or ULSD. The NEW style 2007 Silverado 2500HD, ones actually built after Jan 01 07, will be equipped with the LMM engine and have yet to be delivered to customers. When you go looking for parts for your truck you will learn quickly to specify you have an 07 "Silverado Classic" 2500HD.
 
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