454/TH400 swap for 6.0/4L80 or 6L80. Who's done it? Glad you did? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

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454/TH400 swap for 6.0/4L80 or 6L80. Who's done it? Glad you did?

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07-19-2016, 02:22 PM	#1
GRADYS Performance Registered User Join Date: Dec 2013 Location: Columbus, Oh Posts: 366	Re: 454/TH400 swap for 6.0/4L80 or 6L80. Who's done it? Glad you did? The Dually will not get as good of mileage as the Suburban. More weight and rolling resistance.

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