Swapping a 2004.5lly to a 2006 lbz engine what tune and mods are needed,
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Swapping a 2004.5lly to a 2006 lbz engine what tune and mods are needed,
I have a2004.5 lly 2500HD going to change engine to a 2006 lbz What tune is needed and what mods have to be done.I am going to keep the 5speed trans.