Stupid neophyte questions

[Zorba]

Your speedo has a mechanical gear to calibrate the speed. You just need a different tooth gear. Rubi's have a different type of speedo that requires a "doo-dah" to calibrate it.

https://midwestjeepwillys.com/speedometer-gears.html

I'm not going to say this for certain - but there's a "speed sensor" on the TC with a cable that plugs into it...

 

[Zorba]

Do you mean something like this that goes between the body and the slider?

https://www.extremeterrain.com/pois...52&gclid=CMmr4uyo6-gCFTgffgodLCoPGA&gclsrc=ds

That looks very promising!

 

[2006TJ1]

I'm not going to say this for certain - but there's a "speed sensor" on the TC with a cable that plugs into it...

Post up a pic so we can see. That will help.

 

[bobthetj03]

I'm not going to say this for certain - but there's a "speed sensor" on the TC with a cable that plugs into it...

Ok, you can call it a "speed sensor" of sorts if you like, and it does have an electrical connection that feeds data to the ECM, but you still have to change the gear to a different toothed gear to calibrate the speedo after a tire size change.

If you unbolt the clamp to the sensor on the t-case, you will then be able to pull it out and you will see a plastic gear,

https://www.quadratec.com/c/reference/jeep-speedometer-gear-tooth-chart
That is where the handy little chart comes into play.

 

[Zorba]

Ok, I'll have to wait until tomorrow at the very least to take a picture - its getting dark and its supposed to rain, blah, blah...

EDIT: Never mind, bobthetj03's picture is exactly what I'm referring to. Obviously he knows!