Lock up the TC and you cut the flow of ATF to the cooler. Heat builds up and expensive and often spectacular (a trail of parts and fluid scattered down the road) transmission failures follow.
Face it: The automatic was never intended for hypermiling. The manual transmission is far superior.
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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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