mj86 Posted January 18, 2015 Share Posted January 18, 2015 HELP!!! I have an 86 l/b, putting in 4.0 out of 87. Will a aw4 w/ np231 work? and what drive shaft will need? And to confirm will i need to mod the firewall? I think i might have got in over my head. Any help would b awesome thanks Link to comment Share on other sites More sharing options...
cody.quattlebaum.16 Posted January 18, 2015 Share Posted January 18, 2015 That transmission will work You need to measure for your driveshaft, that's the safest route If you're was build prejune you may need to modify the firewall and radiator support Link to comment Share on other sites More sharing options...
mj86 Posted January 19, 2015 Author Share Posted January 19, 2015 Does anyone have pics of the radiator mod? And what model radiator show i but? Link to comment Share on other sites More sharing options...
cody.quattlebaum.16 Posted January 19, 2015 Share Posted January 19, 2015 You need a complete donor car, that's the easiest way. Link to comment Share on other sites More sharing options...
Eagle Posted January 19, 2015 Share Posted January 19, 2015 You will need a radiator (and supports) from an '87 or newer 4.0L XJ or MJ. You will have to decide whether you want the '87 - '90 "closed" system type, or the '90 + "open" system type. If you are taking the electrics from the '87 donor vehicle, it will be set up with the thermal switch for the auxiliary fan in the left radiator tank. Most of the "open" type radiators don't have a place for this, so you're probably going to need the early style radiator. Link to comment Share on other sites More sharing options...
yxmj Posted January 19, 2015 Share Posted January 19, 2015 Leave the drive shaft worry for the very end.....You can do the entire swap and drive around in front wheel drive if you have to move it.....before you need to think about a drive shaft. And IMHO go with the newer open system for cooling.... :thumbsup: Link to comment Share on other sites More sharing options...
mj86 Posted January 19, 2015 Author Share Posted January 19, 2015 I do have the 87 complete wire harness and computer. Link to comment Share on other sites More sharing options...
mj86 Posted January 19, 2015 Author Share Posted January 19, 2015 I picked up a aw4 and 231 out of 93 cherokee Link to comment Share on other sites More sharing options...
mj86 Posted January 22, 2015 Author Share Posted January 22, 2015 I'm a rookie, i do not know about open and colsed system. Any help Link to comment Share on other sites More sharing options...
gogmorgo Posted January 22, 2015 Share Posted January 22, 2015 A closed cooling system is one where everything is completely sealed. In the Jeep setup, the main coolant "reservoir" is a bottle that permits some expansion of the coolant. The advantages are that the coolant is less likely to get contaminated from outside sources, and that the boiling point of the fluid is higher (due to the greater pressures) so overheating and cavitation are less likely. Also, in the Jeep, there's constant flow of coolant through the expansion bottle, which leads to less crud building up, and added fluids get mixed in much more quickly. The disadvantages are that if you develop a leak, the greater pressure will make it become worse more quickly, and that the greater pressure will add heat to the cooling system. An open system is not under much pressure. The main coolant reservoir is an "overflow" bottle... When the heat expands the coolant, it pushes out into the bottle, and any pressure is vented through the overflow tank. The lack of pressure means that cooling is more effective and leaks are less likely to develop. Heating to the point of cavitation is less likely. Because coolant travels back and forth from the overflow tank in small quantities and the overflow tank's vent is usually mostly just a hole, contamination can happen. The minimal coolant flow through the tank can also lead to crud building up in it, which could plug the overflow, which causes problems. Also, anything you add to the overflow tank may take some time to mix in. You can add it directly to the radiator, but in a full system, popping the rad cap will likely spill some coolant. Jeep went from closed to open cooling in the XJ/MJ in '91, along with the rest of Chrysler's engine control changes that we call the HO. If you do deep water crossing or travel through extremely dusty areas (worse than just dirt roads) then a closed system may be better to keep out contaminants and/or keep your coolant from polluting the watershed. In all other cases, though, the better cooling ability of an open system will be better for you. If you'll be buying new cooling parts, I'd definitely recommend going the open route. If you've got a complete donor with a closed system sitting there, there's not all that much reason for you not to use it, just bear in mind I've seen lots of people convert their closed systems to open, but I've never seen anyone go the other route. In order for your '93 AW4 to play nice, you'll need the transmission wiring harness and computer that came with it. If you've got them from the '87, it won't work properly. In the mean time, though, leaving the trans fuse out or the tranny computer unplugged will allow manual shifting, but will disallow second gear. Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 22, 2015 Share Posted January 22, 2015 Read this thread in it's entirety: http://comancheclub.com/topic/39492-the-truly-custom-86-mj-custom/ I think i might have got in over my head. I think you are too based on your questions. Do your homework. ^^ Link to comment Share on other sites More sharing options...
jimoshel Posted January 22, 2015 Share Posted January 22, 2015 We all gotta learn sometime. Link to comment Share on other sites More sharing options...
yxmj Posted January 22, 2015 Share Posted January 22, 2015 I'm a rookie, i do not know about open and colsed system. Any help Easiest way I have of finding out from someone is ask....."what color is your rad cap"......if they say "what rad cap".....CLOSED......any other answer...OPEN.... :thumbsup: Link to comment Share on other sites More sharing options...
mj86 Posted January 23, 2015 Author Share Posted January 23, 2015 Thanks to everyone who has responded to the questions. Apparently i misunderstood what this section "mj tech" was for. The thread is very helpful but wouldnt have found it. I'm not a mechanic, and want to save money on trying to do it myself. And be able to take pride in doing it. I will be getting help on the Facebook comanche group from now on. Thks again for those who chose to be positive. Link to comment Share on other sites More sharing options...
shelbyluvv Posted January 23, 2015 Share Posted January 23, 2015 I'm sure the tech on there is so much better than here. There's a reason I unfollowed all the XJ and MJ pages on FB. They suck! Good luck Link to comment Share on other sites More sharing options...
mj86 Posted January 23, 2015 Author Share Posted January 23, 2015 They r way more friendly than Hornbrod that is for sure. Link to comment Share on other sites More sharing options...
Strokermjcomanche Posted January 23, 2015 Share Posted January 23, 2015 They r way more friendly than Hornbrod that is for sure. I strongly disagree . He has a wealth of knowledge and will do a lot for anyone on here . You have no idea what you are talking about . And I'm sure many other people will agree . Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 23, 2015 Share Posted January 23, 2015 Hey mate, you said you were in way over your head, and I agreed. Then provided you a link so you could see what you're getting into. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted January 23, 2015 Share Posted January 23, 2015 If you're polite and work with them instead of being defensive then Hornbrod and Cruiser will become your best friends. Cruiser has helped me with numerous problems on my truck for months and still gladly answers questions without telling me to eff off (quite amazed, honestly). Hornbrod has also been quite a good chap with a few situations. Most of us on here are men... we use tough love and bust each others balls. And yes I know this reply did not help the OP's problem at all. Just had to chime in since he said Hornbrod wasn't friendly. Good day fellas :D Link to comment Share on other sites More sharing options...
PEEJ Posted January 23, 2015 Share Posted January 23, 2015 mj86,I believe you missunderstood Hornbrod,The link was ment to help.I'll guarentee you your at the right site,This is the best and most helpfull group of guys on the internet for Comanche help.Search around the forums for what you need to know,If you can't find it searching,don't be afraid to ask,You will get the answer here,I've ask dozens of Comanche questions and every one of them has been answered,And answered quickly and in great detail.You will learn more about your truck here than anywhere else on the net.Guarenteed Link to comment Share on other sites More sharing options...
mj86 Posted January 23, 2015 Author Share Posted January 23, 2015 Telling me to "do your homework" is rude. I was trying to get the right answers, i appreciate the link. Link to comment Share on other sites More sharing options...
shelbyluvv Posted January 23, 2015 Share Posted January 23, 2015 There is no right answer. Do some research and read the link. There are several different ways to swap a 4 0 into a 86. You can decide which way is best. Don just gave you one of them. With your entitled attitude you are better off with facebook teaching you the right way. Link to comment Share on other sites More sharing options...
johnj92131 Posted January 23, 2015 Share Posted January 23, 2015 MJ86, You really have found the very best Comanche resource on the internet right here. The members here have done just about everything you want to imagine with and to their Comanche truck. Sometimes, they have done the same thing several times just to make small improvements and the neat thing is that they will share that knowledge with you by answering questions, offering links, providing part resources and just about anything else, including some really good deals. I am on my ninth year here in the Comanche Club and I still learn new things all the time. You can improve your own knowledge by reading some of the build threads on this site. There are likely more than a dozen build threads related to putting the 4.0 in an 86. There are also other options, like upgrading the 2.8 V6 to a 3.4 V6 with fuel injection. Again, a number of threads with a bunch of details and links that can help with that direction. Our trucks are getting older and parts sources are drying up. You will find alternate parts sources here also. So stick around and you can get that 86 running great. Link to comment Share on other sites More sharing options...
mj86 Posted January 23, 2015 Author Share Posted January 23, 2015 Hornbrod thanks again for the link, I'm sure it will help me greatly. I came to this site to find y'all that have been there. I thought asking u guys was doing my homework. Ive read and talked to SO many people on this conversion, i have almost given up. But I love my Manche. Link to comment Share on other sites More sharing options...
mj86 Posted January 23, 2015 Author Share Posted January 23, 2015 I'm using the phone app, still trying learn the site. Link to comment Share on other sites More sharing options...
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