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Re: 2011 GMC 5.3L to 6.0L
Posted to Technical Theory Forum on 8/6/2017

what year is the 6.0l/trans? what transmission is it?

was the truck originally equipped with a 4 or 6 speed auto?

what engine/trans harness is in it?

what pcm is in it?

i have fixed stuff like this in the past but the required direction to take is HIGH... Login to read more.