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Re: gas mileage
I have a similar setup on my 82 454 th400 dually 3+3 but usually get around 11-13 Mpg mixed highway and city. As i've never done the 700r swap i couldn't help you with that question but i can tell you i never speed when the speed limit is over 55mph and i run radial tires versus the chunky truck ones. Also, if you take it easy on the acceleration your gas gauge will thank you.
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'82 C30 3+3 Dually 454
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