ABS and speed sensor 98 Ranger - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 06-09-2015
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ABS and speed sensor 98 Ranger

I am planning to swap my 7.5 axle to a GM14 Bolt.

There is no room in the axle husing for my ABS and speed sensor, but maybe it can be placed on the drive shaft.

The standard tone ring has 108 teath and rotates on the ring gear. My standard axle is 3:73 and the one I want to use is 4:10

I have seen relocator kits on the internet and if I understand this correct you divide 108 teath with your axle ratio?
So you end up with 29 teath on the driveshaft.

The way I see this is that you will less impulses from the sensor this way, so what is the trick to get the speedometer to show the actual speed?
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Old 06-09-2015
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the GM 14 bolt axle is way over kill for a ranger

the newer 14 bolt axles already have the tone ring connection on top of the differential housing

the vehicle speed sensor resides on the transfer case , NOT the rear axle itself
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Old 06-10-2015
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Mine is a 2WD so no transfer case and I know this is what you call overkill. I just call this heavy duty
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Old 06-10-2015
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Quote:
The 1998-2000 Rangers are not equipped with a VSS (Vehicle Speed Sensor). The PCM (Powertrain Control Module) receives vehicle speed information from the antilock brake system rear wheel speed sensor. The raw signal from the ABS/VSS sensor on the rear axle goes directly to the 4WABS module where the signal is corrected for tire diameter. Then the corrected signal is sent to the PCM, speed control, cluster, etc. In this system, the PCM and speedometer is an end user of the corrected VSS signal.
So you will need to reprogram ABS module if you will be changing the Pulse per mile count, this includes changes tire size, axle ratio, or tone ring location.


Dakota Digital makes an adjustable pulse interface: Universal Speedometer Signal Interface
$85, but it allows you to change things without having to reprogram ABS each time

Not sure how the ABS module will react to the VSS sensor and rear wheel sensors have such big change(axle tone ring to driveshaft tone ring), it shouldn't matter BUT, those are always "famous last words", lol.

Last edited by RonD; 06-10-2015 at 08:55 AM.
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Old 06-10-2015
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Thanx Ron
I will look into that.

The SGI-5 is used as either a signal multiplier (up to 4X) or signal divider (up to 125X), making this unit extremely flexible for almost any application.

So if I divide 108 with 4, and put 27 teath on the driveshaft and let the box multiply that by 4, I will end up with signal I started out with.

Does the distance between the teath matter? I have seen some homemade tone rings to have like ½ inch wide teath and a short space between them.
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Old 06-11-2015
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That reads right.

Also...........many transmissions still have the hole for VSS/speedometer cable in the tail shaft housing, and the tail shaft housing can be removed to install the worm gear.
And you can still get different different gears to adjust for axle ratio and tire size
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