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6.0 swap 5.3 what would I have to change if anything


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Hello Guys I have a 2003 crew cab Dually and I pull one car at the most with it. It drinks gas like pouring it on the ground and not impressed with the power !!! And then I have a 2000 Suburban with a 5.3 and pulling the same trailer with a car on it seems to have just as much power and gets way better gas mileage. I dont need a power house I would just like to be a bale to drive my dually around even when I am no hauling a car. Its loaded with dvd and all but I cant afford to drive it unless I am making money with it!!! What would I have to do to swap and put a 5.3 in it???

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IMO- i would start by getting a good tune for it. GM's tunes for the LQ4-LQ9 suck..my 03 SS was terrible on power and mpg before the tune. i have been getting about 15.5 around town, and 17+ mph HW. the 4L80e trans it known for sucking down fuel. also what gears are you running.

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