Ranger 4WD V6-3.0L VIN U (1997)
Speedometer Head: Adjustments
Speedometer accuracy can be checked by timing the vehicle on a measured mile and performing the following speedometer calibration test. The Ford
Speedo Gear Supplement Charts show the proper speedometer gears to use for various rear axle and tire size OEM combinations.
SPEEDOMETER CALIBRATION TEST
1. Time the number of seconds it takes to travel one measured mile at an indicated 30 and 60 mph.
2. Calculate the vehicle speed using the following formula: mph = 3600 divided by seconds
3. Acceptable ranges are the following:
Indicated Test Speed .......................................................................................................................................................................................... Seconds
16.1 kmh (10 mph) .......................................................................................................................................................................................... 345-275
48.3 kmh (30 mph) .......................................................................................................................................................................................... 115-125
96.5 kmh (60 mph) .............................................................................................................................................................................................. 57-62
