There are still plenty of old 94-96 D-Body Fleetwoods running around with 2.56 gears and 350 LT1 engines.
Lower engine RPM at a given road speed = better MPG. The trade-off is sluggish acceleration.
I thought this site was all about the MPG.
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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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