NP231s from later years

[crumbscomanche]

Hi all, I'm looking at picking up the np231 out of a '97 XJ that @MeanLemons built and i had a quick question - does anyone know if there's an issue with the later year NP231s having a different speedo output style, and if they are able to bolt up with earlier years? It doesn't look like it's a problem but want to be sure. Novak has this on their website:

 

Early 231s from 1988 through 1991 featured a conventional mechanical (cable) drive speedometer output. In 1992, Jeep introduced a three-wire, digital square wave Vehicle Speed Sensor (VSS), in the vein of modern automotive systems. 

[Swampy]

You can swap the speedo setups I am assuming, cable to electric and vise versa. If you can't that would explain why my speedo doesnt work at the moment

[Pete M]

the later years have an electric pickup that can be swapped out for the mechanical one from the earlier years.    you may need to mix annd match the little shafts that the speed gear is on.  

[MeanLemons]

SYE kits says it fits np231 from 1987-2006.  They don’t have two separate kits for 87-92/93-06.

 

the hole machined on the tailhousing is exact same size for both mechanical & electric speedos. 

[crumbscomanche]

@MeanLemons @Pete M sorry for the delay on replying. Is it literally pull out the electric cables and plug in the mechanical speedo? are we talking about these gears? maybe I'm over . complicating but I want to make sure it's not a ton of trouble. 

 

 

[MeanLemons]

You pull the mechanical speedo out of your t case, and plug it back in after you install the new t case.  

[HOrnbrod]

Everything you need to know about speedo gears is HERE.

[Pete M]

some years had shorter shafts than others and I had to pop the little gears off and swap them.