AF Comanche Posted May 28, 2014 Share Posted May 28, 2014 Will a AW4 out of a 2001 Cherokee be an easy swap for my 1988 MJ? Both are 4wd with the 4.0. Would I need other driveline parts off the Cherokee? Link to comment Share on other sites More sharing options...
cruiser54 Posted May 28, 2014 Share Posted May 28, 2014 There are some electronic differences for sure. Link to comment Share on other sites More sharing options...
benjy_26 Posted May 28, 2014 Share Posted May 28, 2014 Stock to stock it'll be a pain to make it work. It's best to use OBD1 trannys to replace OBD1 trannys. If you use a Bajashifter, it MAY be easier, though I'm not 100% on that. Link to comment Share on other sites More sharing options...
mvusse Posted May 28, 2014 Share Posted May 28, 2014 88 Comanche isn't even OBD I, it is Renix. OBD I was from 1991 through 1995, OBD II is from 1996 onwards. For plug in swap you'll need an AW4 from 1987 through 1990. Link to comment Share on other sites More sharing options...
benjy_26 Posted May 28, 2014 Share Posted May 28, 2014 Does the Renix ECM control or read the tranny? If not, the OBD1 tranny should work alright, assuming you get the accompanying TCM. Link to comment Share on other sites More sharing options...
cruiser54 Posted May 28, 2014 Share Posted May 28, 2014 Does the Renix ECM control or read the tranny? If not, the OBD1 tranny should work alright, assuming you get the accompanying TCM. Ask Paradise XJ about that....... Link to comment Share on other sites More sharing options...
Incommando Posted May 28, 2014 Share Posted May 28, 2014 I am pretty sure that on top of any potential electronics differences you might need to swap t-cases, too. If my ever fading memory is correct the output of the 88 is 21 spline and the later is 23 spline Link to comment Share on other sites More sharing options...
cruiser54 Posted May 28, 2014 Share Posted May 28, 2014 I am pretty sure that on top of any potential electronics differences you might need to swap t-cases, too. If my ever fading memory is correct the output of the 88 is 21 spline and the later is 23 spline That, too. Link to comment Share on other sites More sharing options...
benjy_26 Posted May 29, 2014 Share Posted May 29, 2014 So... DOES the Renix ECM care what tranny is in the car? Link to comment Share on other sites More sharing options...
cruiser54 Posted May 29, 2014 Share Posted May 29, 2014 So... DOES the Renix ECM care what tranny is in the car? No, but the tCU does. Link to comment Share on other sites More sharing options...
benjy_26 Posted May 29, 2014 Share Posted May 29, 2014 So... DOES the Renix ECM care what tranny is in the car? No, but the tCU does. Assuming one can get rid of the Renix TCU ( by using a manual shifter), is it safe to assume that one can run an OBD1/OBD2 tranny behind a Renix engine? Link to comment Share on other sites More sharing options...
ParadiseMJ Posted May 29, 2014 Share Posted May 29, 2014 Does the Renix ECM control or read the tranny? If not, the OBD1 tranny should work alright, assuming you get the accompanying TCM. Ask Paradise XJ about that....... If you put an HO AW4 tranny in a Renix truck...that was previously a manual (and therefore had no TCU)...you need to use a Renix TCU...AND the engine side wiring harness helps too. Cross wiring the HO to a Renix harness...is a B---ch. It took me literally 15 minutes to pull a good Renix wiring harness that would work with my 94 AW4 from the junkyard and another 15 to plug it all in to my MJ. I A$$umed that the HO TCU should go along with the HO tranny...Realizing I needed a Renix TCU took me...uh...a LOT longer to figure out, as well as losing quite a bit of hair. If I recall I spent 2 months trying to figure out why it wouldn't shift right. It was because I had the HO TCU...which if you compare the wiring diagram coming out of each respective TCU are different pin outs. I finally figured it out when I got hold of both wiring diagrams at the same time. I was able to go back to the junkyard and nab the TCU from the same XJ I had gotten the harness from. Thing drives and shifts like butter now. I am pretty sure that on top of any potential electronics differences you might need to swap t-cases, too. If my ever fading memory is correct the output of the 88 is 21 spline and the later is 23 spline That, too. If you're using a 91+ tranny, you need a 91+ t-case. You could keep the t-case, but you'd need to swap the tranny output to match the t-case spline count...alot more trouble than it's worth. You could get a 91+ t-case in a swap for a nice VCR. So... DOES the Renix ECM care what tranny is in the car? No, but the tCU does. I never had to change out the ECU. Renix to HO...I couldn't tell you about a 97+ or any namby-pamby short cut shifter set-up...I did it the extra hard way. :rotfl2: ...Thank for the referral Cruiser...LOL...OL... :thumbsup: Link to comment Share on other sites More sharing options...
JENSSEN Posted May 29, 2014 Share Posted May 29, 2014 There is a "pulse" difference on older trans vs the newer ones , older trans is a single pulse and newer is 3 I believe. You can swap some of the guts to make it work, I have had a friend do so. Link to comment Share on other sites More sharing options...
gogmorgo Posted May 29, 2014 Share Posted May 29, 2014 Relevant Naxja thread: http://www.naxja.org/forum/showthread.php?t=1053970 Link to comment Share on other sites More sharing options...
ggcnash Posted May 30, 2014 Share Posted May 30, 2014 Relevant Naxja thread: http://www.naxja.org/forum/showthread.php?t=1053970A great thread Link to comment Share on other sites More sharing options...
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