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Hey! Don't forget about me!
I swapped the R&P in the rear axle of my F-350. I went from a 3.73:1 (2000 RPM @ 70 MPH) to a 3.08:1 ratio (1700 RPM @ 70 MPH).
My MPG improved from 20 MPG to 23 MPG at the time. A 15% improvement in MPG is nothing to sneeze at.
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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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