Jeepjeff859 Posted December 17, 2015 Share Posted December 17, 2015 in the future (probably when my clutch goes out) I'm thinking about ditching the AX15 for a automatic. Can anyone point me to a thread about this or offer advice on what transmission and parts to look for? 1994 jeep grand cherokee engine 1986 comanche body NP231 transfer case Link to comment Share on other sites More sharing options...
Jeepjeff859 Posted December 17, 2015 Author Share Posted December 17, 2015 when i did my 86 2.5 to 4.0 swap i made sure i kept the transmission control module and every bit of the wiring harness so theoretically i should only need a transmission, torque converter, transmission cooler and lines and then the shifter assembly right? Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted December 17, 2015 Share Posted December 17, 2015 when i did my 86 2.5 to 4.0 swap i made sure i kept the transmission control module and every bit of the wiring harness so theoretically i should only need a transmission, torque converter, transmission cooler and lines and then the shifter assembly right? Won't work with at AW4 auto... The TCM and associated wire harness from your 86's original auto trans is not compatible with the AW4 used in '87+ 4.0s. Link to comment Share on other sites More sharing options...
Jeepjeff859 Posted December 17, 2015 Author Share Posted December 17, 2015 I meant my 1995 harness Link to comment Share on other sites More sharing options...
Zebvance Posted December 17, 2015 Share Posted December 17, 2015 I want to do the opposite swap. Link to comment Share on other sites More sharing options...
Jeepjeff859 Posted December 17, 2015 Author Share Posted December 17, 2015 Sadly the Ax15 I have is a internal slave Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted December 18, 2015 Share Posted December 18, 2015 I meant my 1995 harness In that case, I see no reason as to why you couldn't. Sadly the Ax15 I have is a internal slave Why not covert it to external? It's fairly easy to do. Link to comment Share on other sites More sharing options...
Pete M Posted December 18, 2015 Share Posted December 18, 2015 there's a thread somewhere in the DIY forum about swapping between stick and auto. http://comancheclub.com/topic/48710-diy-projects-writeups-master-search-index/ Link to comment Share on other sites More sharing options...
cruiser54 Posted December 18, 2015 Share Posted December 18, 2015 Paradise knows all about it..... Link to comment Share on other sites More sharing options...
ParadiseMJ Posted December 21, 2015 Share Posted December 21, 2015 when i did my 86 2.5 to 4.0 swap i made sure i kept the transmission control module and every bit of the wiring harness so theoretically i should only need a transmission, torque converter, transmission cooler and lines and then the shifter assembly right? T-case same era as your tranny. If you get a tranny from a Renix, you'll need a 21 spline t-case and a Renix TCU and a Renix harness. If you get an HO tranny, you'll need a 23 spline (HO+) t-case, etc. etc. You need a flexplate AND the bezel (or washer, spacer...whatever it's called. You'll also need shorter bolts to bolt the flexplate to the crank end...since your flywheel is much thicker than the flexplate, the bolts will stick through and interfere with the crank (learned the hard way, again). You may need a new throttle cable, and you'll need to shorten your rear driveshaft about 1.5" and get an automatic front driveshaft (the AW4 is longer, so the t-case mounts an inch or two back, the front shaft needs to be longer) If you get a 91+ tranny, you'll need a 23 spline t-case, HO TCU and an HO harness. Since you have a 94 engine, you should shoot for a 94 tranny, but not entirely necessary. You'll need a harness compatible with your engine AND TCU or the TPS wiring will be different and you'll get no signal top the TPS thru a Renix hjarness. I've never changed the ECU. It's stick original 88 stick, but it works fine. The TCU female connector and male harness connectors are color coded (the connectors are the same color) If you have a tan connector and a green TCU...it won't work right and vicey-versy. When I swapped the BA10 out for the AW4 I didn't change the harness. I (stupidly) tried to wire it up myself with the existing TCU and existing harness...big mistake. I messed with it for a few weeks before I checked another wiring diagram. So, other than wasting lots of time, I learned a little. I went to the junkyard and in about 20 minutes I had the "new" harness out. It took another 1/2 hour at home to remove the old harness and plug the new one in. I got the new TCU from the same 1990 XJ Automatic. I plugged all that in, fired it up, and boom...perfect. That's all I got for now, if you have any questions going in to this feel free to PM or just keep posting. Make sure you use an actual transmission jack instead of a mocked up floor jack, you'll thank yourself later. Also, I loved driving the stick but it was a POS, and driving the automatic is nice too since it's a road warrior more than an off road truck. The AW4 is a damn strong tranny. Good luck. Link to comment Share on other sites More sharing options...
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