crumbscomanche Posted May 22, 2018 Share Posted May 22, 2018 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. Link to comment Share on other sites More sharing options...
Swampy Posted May 22, 2018 Share Posted May 22, 2018 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 Link to comment Share on other sites More sharing options...
Pete M Posted May 23, 2018 Share Posted May 23, 2018 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. Link to comment Share on other sites More sharing options...
MeanLemons Posted May 23, 2018 Share Posted May 23, 2018 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. Link to comment Share on other sites More sharing options...
crumbscomanche Posted May 24, 2018 Author Share Posted May 24, 2018 @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. Link to comment Share on other sites More sharing options...
MeanLemons Posted May 24, 2018 Share Posted May 24, 2018 You pull the mechanical speedo out of your t case, and plug it back in after you install the new t case. Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 24, 2018 Share Posted May 24, 2018 Everything you need to know about speedo gears is HERE. Link to comment Share on other sites More sharing options...
Pete M Posted May 24, 2018 Share Posted May 24, 2018 some years had shorter shafts than others and I had to pop the little gears off and swap them. Link to comment Share on other sites More sharing options...
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