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A taller gear did wonders for my truck. Replacing 3.73s with 3.08s gained me 3 MPH on a 20 MPG truck. Now I go down the road turning 1700 RPM @ 70 MPH.
Gotta watch taller gears if your vehicle is an automatic. Less flow through the cooler will lead to spectacular (parts and ATF scattered down the road) automatic transmission failures. If you have a manual, you are golden.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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