Originally Posted by 95Z28A4

From the information I have found, it seems a 3.91 geared 3rd gen 4Runner did not come from the factory with 16" wheels. Hence, no ABS modules are available that will correct the speedometer for 265/70/16 tires.



But.....if my math is correct, an ABS module for a 4.30 geared 4Runner with 265/70/16 tires will produce a speedometer signal that is within 1% of accurate when used in a 3.91 geared 4Runner with 265/70/16 tires that was originally equipped with 225/75/15 tires.



It is my understanding a 3rd gen 4Runner with rear diff lock always has 4.30 gears and that ABS module disables ABS when the diff is locked. Is that correct?



Does anyone know if an ABS module that was used in a 4Runner with a rear diff lock will work in a 4Runner that does not have a diff lock?

Originally Posted by Doc2012

I have a Dakota digital SGI-5E in mine.

Pm me and we can talk.


Sent from my iPhone using Tapatalk

Originally Posted by 95Z28A4

From the information I have found, it seems a 3.91 geared 3rd gen 4Runner did not come from the factory with 16" wheels. Hence, no ABS modules are available that will correct the speedometer for 265/70/16 tires.

But.....if my math is correct, an ABS module for a 4.30 geared 4Runner with 265/70/16 tires will produce a speedometer signal that is within 1% of accurate when used in a 3.91 geared 4Runner with 265/70/16 tires that was originally equipped with 225/75/15 tires.

It is my understanding a 3rd gen 4Runner with rear diff lock always has 4.30 gears and that ABS module disables ABS when the diff is locked. Is that correct?

Does anyone know if an ABS module that was used in a 4Runner with a rear diff lock will work in a 4Runner that does not have a diff lock?

Originally Posted by brillo_76

Ok. So no way to fix this except 3rd party speed boxes? Hmm. I need to investigate this further. As the 4 runners came with both 15 and 16 inch rims. Something has to be telling the speedometer the wheel speed. I always thought it was the rear abs sensors. Or in non abs the transmission vss sensor.


On the vss sensors. The diff ratio would matter.

Sent from my SM-A536V using Tapatalk

Originally Posted by 95Z28A4

How do I PM you? I don't see a private message link that I can click.

Originally Posted by 95Z28A4

But.....if my math is correct, an ABS module for a 4.30 geared 4Runner with 265/70/16 tires will produce a speedometer signal that is within 1% of accurate when used in a 3.91 geared 4Runner with 265/70/16 tires that was originally equipped with 225/75/15 tires.

Originally Posted by Doc2012

I sent you a PM.


Sent from my iPhone using Tapatalk

Originally Posted by Bad Luck

The ABS module does not care what differential gearing you have as that is before the wheel speed sensors. Any changes/differences after the wheel speed sensors (tire size) is what the ABS module has to calculate for.

Originally Posted by phattyduck

Gear ratio has nothing to do with the speedometer on ABS equipped 3rd gen 4Runners. Since the ABS tone rings are used, only the speed that the hub is rotating matters (not the trans/t-case output).
-Charlie

Originally Posted by 95Z28A4

OK....I get it now. Because the tone rings are mounted on the axles, they turn at the same RPM as the wheels regardless of gear ratio.

Shouldn't any ABS module for a 1997 non-locked 3.4L 4Runner with 16" wheels correct the speedometer?

Originally Posted by Bad Luck

In theory yes since you are going to a stock size, but that would be a trial and error sort of situation as no one can verify what each of the module options available do exactly. They may be for the correct size, but what are the other differences between them that require a different part number? It could be anything from different caliper size calibrations to different manufacturers for the same part.

EDIT: I know you keep saying wheel, but to clarify it's the overall tire size that is important for the speedometer calculation not just the wheel size. I'm pretty sure we're saying the same thing here, but wanted to make sure.