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7.5 to 8.8 speedo error


Kim

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Location
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Vehicle Year
2001
Make / Model
Ford Ranger
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3.0 V6
Engine Size
3.0L
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Manual
2WD / 4WD
2WD
I think I have found the reason why my speedo is off. My Ranger had an 8.8 swapped in place of the original 7.5, and the speedo reads fast.

Larger diameter tone gear with more teeth being picked up by the sensor?
What can I do to fix this...I'm assuming a 7.5 tone gear will not fit in place of the 8.8 version. I don't think I want to grind a few teeth off the thing either lol

Ideas? I'm going to be in there swapping the gears eventually anyway, so I should find out what I can do to fix the speedo error as well.
 


RonD

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They don't make tone rings with different tooth counts.

1998 to 2000 speed sensor goes to ABS module, ABS module is what has the speed calibration correction software.
It is given the "rotations per mile" number at the factory and then sends the speed pulses out to speedo, cruise and computer.

You could get an 8.8" ABS module.
Axle ratio doesn't matter with this setup since it is measuring rear axle rotation not drive line rotation.
Tire size of course matters, so if you are not running stock tire size then having current ABS reset for 8.8" and tire size would be better.
 

Kim

Well-Known Member
Joined
Mar 28, 2016
Messages
49
Reaction score
53
Points
63
Location
Wisconsin
Vehicle Year
2001
Make / Model
Ford Ranger
Engine Type
3.0 V6
Engine Size
3.0L
Transmission
Manual
2WD / 4WD
2WD
I'll look into that then. Thank you!
 

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