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Re: mileage
Running an 84 GMC SWB, with a 385 stroker, through a 700R4, to 3.73 gears--getting 14.5 to 15 MPG on the highway. I run 28" tires on the rear and 27" on the front. My RPMs are at 2500 at about 72 MPH. I consider this a good combination, since I have a lot of hilly areas to deal with and this allows the cruise to work without a lot of hard revving to make it over the hills.
My Son's truck has a 350, 700R4, with 3.73 gears and he gets around 13.5 to 14 MPG.
Both of the 700 R4 trannys do NOT have the Lock up converters-----They were built this way.
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Frank
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