Greenhornet Posted October 28, 2019 Share Posted October 28, 2019 I just bought a 89 Comanche 4.0 other a 5 speed. My new project never worked on a Jeep so I’m getting educated. I would like to build a newer 4.0 for it and a new transmission to match can anyone tell me what will bolt up thoughts on gearing ( not going to be rock crawling more of a ice fishing rig/mud not to extreme) Link to comment Share on other sites More sharing options...
derf Posted October 28, 2019 Share Posted October 28, 2019 If you get an AX-15 from a newer 4.0 Cherokee or Comanche, it's pretty straightforward. The gearing will depend on exactly which transmission you get as well as the size of the tires you want to run. Bigger tires = higher number gears. If you go to http://www.grimmjeeper.com/gears.html you can just pick the transmission and transfer case (NP231) from the drop down menus and plug in tire size. Then play with gear ratios depending on what size tires you pick. Link to comment Share on other sites More sharing options...
Pete M Posted October 28, 2019 Share Posted October 28, 2019 just a point of clarification, are you looking to rebuild a newer block and reuse your trucks wiring? or are you looking to swap over everything from a newer XJ? Link to comment Share on other sites More sharing options...
Greenhornet Posted October 29, 2019 Author Share Posted October 29, 2019 I’m not keen on keeping Renix. Can I just instal a holly sniper EFI to simplify things? I’ve never dealt with computers or harnesses Link to comment Share on other sites More sharing options...
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