Well, if you bought the car and it had aftermarket gears on it, then you have to do the math on the tire size and RPM per MPH. Otherwise, if you have stock gears then look at the metal tag on your Diff Cover. Mine showed 3L08 for 3.08 Locking, they are the same for the other types.
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// 1998 GT-Steeda Conversion \\ -- Sold
// Now own 2001 F-150 SuperCrew 5.4L \\
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