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I have shifted my 5 speed (3.55 gears, 255/70/16 tires) at 30, 55, and 80. It hits the speed limiter before 4th is wound out. It has never hit the rev limiter. Those shift points are approximately 5200 rpm.
You sure you don't have 4.56's or something? Have you ever calibrated your speedometer and odometer against the highway mileposts? Do you have or can you borrow a GPS?
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2003 F150XL 4.2 short cab/bed 4x2 5 speed manual 3.55 LS
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